[Richard]

I suspect that the “pressure relief valve” that you closed and opened three turns as stated in thread 21 is still closed too much. That is not a pressure relief valve. It is a flow control valve that is intended to control the speed the room moves in and out. Just for grins, open it until the number 5 shows on the side of the valve.

The alternator squealing when you hit the switch is an indicator the hydraulic motor may, and I emphasize this is a theory, be trying to pump against a dead head. My first guess is a closed flow control valve. My second guess is miswired retract and extend solenoids.

If opening the valve doesn’t fix the issue, then unhook the two connectors for the extend and retract solenoids, and with help confirm which is which by checking for voltage when extend and retract is activated. You might look first at the wiring harness that connects to the solenoids. On mine Newell put small white tabs on the coach side of the harness identifying what the wires were for. Hard to see, and sometimes nasty, but if they are there would be a great confirmation.

Third exercise. When the extend button is activated what LEDS are lighted on the Room 2 control board? Use the numbers on the Rosetta Stone diagram to identify them. You will be looking for LEDs 85 through 90.

The fact that the locking pins are coming up is great news.

Thank you for the detailed summary of what is going on.