Error code P1780?

My previous question was removed. However, there is huge update - suspect ECU failure. Vehicle start and running. Replaced NSW and error still active/same. All signals from NSW to ECU seems correct with solid battery voltage, no shorts between wires. I've replaced burnt bulb for "D" on dash and found - when change from "N" to "D", it takes about 3 seconds to "D" appears, same for "2" to "D". When change from "D" to "N" or "2", "D" stay on for 3-4 seconds, together with "N" or "2", then turns off. I open ECU and check for leaked capacitors and cracked soldering points - all seems OK, cleanup ground to cover. Check, and now time to change indicator changes to 5-10 seconds. It is feels as capacitor slowly charge and slowly discharge. There is JC8 on the way to dash from ECU that I plan to check, but very low chance it would be root. Also, I want to check if there is any delay from NSW to ECU - low chance since there is simple mechanical switch, so disconnect should be quick. Have no idea where to look anymore. Can you please advise what to check. Thank you.