You have most of it.. The main thing is make sure that the service you
get replaces the filter etc... the Suck and replace fluid thing is a
waste of cash...

Fluid and filter, not significantly different than any other Chrysler
automatic since 1950. Use ATF+4. I recently read an SAE paper
characterizing ATF+4, and the most amazing thing the paper revealed
wasn't how GOOD ATF+4 is (although its a superior fluid, better in most
metrics than Mercon-V) but how BAD ATF+3 really was. It appears (just
guessing- the paper doesn't say) that in order to get the right friction
characteristics a lot of compropmises on oxidation rate, viscosity
stability, and other basic parameters were made. No WONDER we've been
finding that +3 equipped vehicles need fluid changes every 50k miles! +4
fixes all those shortcomings.

I don't have a PT, but expect that preventive maintenance it is the same as
for any other Chrysler transmission and that access should be just as easy
as well.  (And should not be too much different from what you do for your
antique either...)

Getting to the 13 or so pan bolts is usually easy on a front wheel vehicle
using a basic 3/8"  metric socket and ordinary extensions.  The biggest
problem I've had with changing fluid and filter is that there is no drain
plug, so it is a bit messy when you break the RTV sealant used by the
factory.  I've found that if you leave some of the pan bolts on by a few
threads, you can slip a putty knife in at a corner you can pry the pan free
without causing any pan deformation or re-sealing problems.  I then remove
some bolts and tilt the pan down from one side and try to get as much fluid
to drain into my catch basin before dropping the pan by hand the rest of the
way to get the rest.  Having some newspaper or cardboard under the pan area
and wearing old clothes is a very good idea.  Once I get the pan off, I
usually leave it to drain overnight to try to get as much of the old fluid
as I can out.

I then thoroughly clean off all the old dried RTV from both the transmission
housing as well as the pan using a razor scraper and wire brush.  I then
replace the filter with a new Mopar one and thoroughly clean the inside of
the pan using brake cleaner spray some paper towels, and a soft cotton rag.
I then clean off the magnet of all metal filings before replacing it in the
clean pan and then re-installing  it to the trans housing.  I personally
like using the Chrysler combination metal/silicone gasket which is a bit
expensive than RTV, but can be re-used up to three times. I then re-torque
all the bolts using an alternating pattern to the FSM spec before refilling
with the same amount of ATF+4 that I drained in the catch basin or lost to
the floor.  (Recheck the ATF level after you start up the car and circulate
the fluid for a few minutes using the procedure in the owners manual.)  Most
times this is about 6 quarts or so of new fluid.

I have three Chrysler cars and a Mitsubishi that uses a Chrysler trans as
well.  I do this to them all every 30-36K miles and have not had experienced
any trans problems on my 4 vehicles.  The oldest, a 1991 3000GT, currently
has over 130K miles and still shifts very smoothly.

Good luck!

Bob