Chrysler Repair: 99 Chrysler Town & Country error P0750, solenoid pack, solenoid switch

Question
Initially changed tranny fluid & filter.After replacing both the PCM & TCU,My 99'Town & Country 3.8ltr,ran fine for about a week, and is now coming up with error code P0700 & P0750-Shift solenoid A. About 600 bucks later and it still doesn't shift.

Answer
The 0700 is a catch all saying there is a specific code for the transmission in the memory, which is the 0750. That code says there is a lack of response from the low/reverse solenoid switch which would probably cause the 'limp in' mode that the transmission has adopted to protect against damage. Was the solenoid pack replaced in that $600 repair?
If so, then I would be inclined to check the wiring between it and the pcm. If the 0750 was present when the repair was done, then the repair was not done correctly.
If not, then the solenoid is the most likely source of the problem. Fortunately the pack can be replaced without removing the transmission from the vehicle. The low/reverse solenoid is connected on pin 7 of the trans pack plug to pin 20 of the tcm. So you could verify the continuity of that connection.
Roland