Hello and welcome to JustAnswer.com. As I have read your description of the problem and viewed all the applicable trouble data for the P0753 code I would have to say that it is very likely that you have a fault internal to the PCM. These will also show symtoms more often with extreme temperature fluctuations as the circuit boards expand and contract slightly. If you have already relaced the trans. solenoid assembly and inspected the harness and have found a bent terminal at the pcm it is very likely the PCM will need to be replaced to resolve this issue. I would replace the A/T control relay in the underhood fuse block either way as this could contribute to eroneous resistance readings at the PCM. My suggestion is to replace both these parts. I have seen these PCMs do this before and based on your tests would recomend this. Let me know what you think. Thanks.
Thank you. I hope all goes well with this.