P1765 and P0753 Error Codes: Diagnosis and Fix for 2003 Jeep Grand Cherokee Laredo 4.0L 4WD

I'm experiencing error codes P1765 and P0759 on my 2003 Jeep Grand Cherokee Laredo with a 4.0L V6 engine and 4WD system. After reviewing common causes, the most frequently reported issues are the transmission relay and the overdrive/TCC solenoid. I have already replaced both components — the relay installation was straightforward, but the solenoid replacement proved more difficult. Despite these replacements, the symptoms persist. Symptoms include: - Severe sluggishness when starting from a stop - The vehicle appears to start in 2nd gear rather than first - Check Engine Light remains illuminated - Error codes do not clear after disconnecting the positive battery terminal for 12 hours - Manual shifting into 1st gear works properly, but shifting manually to 2nd gear shows no change in RPM or any shift indication - Transmission fluid is at proper level and may be slightly overfilled - When idling or with the key in ACC position, symptoms occasionally worsen — sometimes the engine feels like it's starting in 3rd or 4th gear before stalling I'm concerned whether my installation of the new solenoid was incorrect. Could there be a wiring issue or improper connection that I missed during reassembly? Any guidance on how to verify proper operation after replacement would be greatly appreciated.