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The gear on my 1977 FT337GP had similar problems with inconsistent door closing. The main indicator was the amber light staying on and then the need to cycle the gear again.
BTW when you turn the master switch off, you reset all the solenoid positions and all the valves in the pack which is what is suggested in the emergency proceedures.
In our case we rebuilt the door open & close solenoid along with replacing most of the seals in the power pack. The actual problem was a gear up mirco switch on one of the main that was flakey and seemed to react to air loads. We replaced that switch and did a total re-rig on the gear.
So far so good as I search for wood to knock on.
My advice would be to carefully check all the gear rigging and switch rigging per the service manual and check all the switches in the system.
Regards - Dave
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