Scott,
I have found a copy of the article at work 
Amazing what we keep at our
offices,all the interesting things.
What makes you think your bands need adjusting. I would suggest that
you would do it as well as or better than a garage, and take more care over the
job.
There are pictures Scott, of where the adjusters are, but my ascii art is
awful.
I could fax it if you need. On the other hand, over the months the articles
covered all aspects of testing these gearboxes, pressure tests, road tests,
over a period of about 1 year. I could snail mail them to you if you wish?
Alastair Lauener
64 3.4 S-Type
@Alastar_W_Lauener
Reproduced without permission
Jaguar Driver Technical Tips Aug 92
Borg Warner 65/66
Rear Brake Band
The adjuster is situated on the right hand side towards the rear of the main
gearbox case.
Tighten the adjuster to 5lb.ft., then back off 3/4 of a turn, and tighten the
locknut. Unfortunately, the lock nut is fairly deeply recessed into the gearbox
case, and presents quite a problem for the spanner attack. It is often
possible to slacken it with a 3/4 socket and swivel handle, although
tightening is more difficult because a socket does not allow the sauare
adjuster to be held at the same time.
If you are really in trouble:- Adjust the band and whilst holding the square
adjuster to prevent rotation, tighten the locknut with fingers. NOTE the
position of the adjuster and very carefully, in very small increments
(about 1/8 of a turn) tighten the locknut with a socket and confirm wether or
not the ladjuster has moved. If it is prone to (and aren’t they all),
try taking the adjuster back a measured amount and comparing the final
position of the adjuster. It might be a bit of a fiddle, but it should enable
you to accomplish the task in hand.
Front Brake Band
The adjuster is situated on the left hand side towards the front of the
main gearbox case between the oil cooler unions. Adjustment is
carried out in an identical manner to the rear brake band.
These were taken from the British Jaguar Drivers Magazine, August 92
(Scott, this actually came first)
Before carrying out Band adjustment we must consider whether or not
it is advisable, and unfortunately there is no sure way of reaching an
absolutely positive conclusion
As the band wears, the thickness of the friction lining will gradually
be reduced until eventually, the metal outer casing will come into contact
with and score the hub which it holds. Should =this occur, the only method
of rectification is to remove ther gearbox and overhaul it completely.
(Just replacing the band will not be successful due to the metal dust which
will be deposited throughout the whole of the transmission and torque
convertor)
The snag is that the condition of the brake band cannot be ascertained without
removing it from the gearbox, thus leaving us unable to find the answer to a
very important question:-SHOULD THE BAND BE ADJUSATED
The only reliable response to this query is NO, but I can appreciate that very
few people wish to overhaul the transmission if it is not necessary.
How about posing a few queries which help to indicate the condition of the
gearbox
1 Was the fluid contaminated with metal or fibre particles?
2 Did the fluid have an odour of burning fibre?
YES/NO The decision is yours.
The procedure is generally as follows
1 Clean the area round the adjusters before adjusting
2 Hold the adjuster square (5/16AF) to prevent rotation
3 Slacken the locknut (3/4AF)
4 Move the adjuster back and forward about two turns to confirm
free rotation and lubricate if necessary
5 Tighten the adjuster to the correct torque
6 Hold the adjuster to prevent rotation and tighten the locknut
7 Grease the protruding thread to prevent corrosion