I have encountered a problem that is driving me bonkers. A friend gave me an 80 inch Midwest Extra 300S some time back that needed some TLC. All radio gear had been removed from the plane except for the two servos in the wing which are Futaba S9101 servos. One of the first things I did was test those servos with a servo tester and they worked fine so I gave it no more thought. I recovered the wing and was reassembling everything when it came time to test the ailerons for proper throw. I am using a Futaba 7C transmitter that has never had any issues. I plugged the servos in to a new Futaba receiver and they did not work. I re-tested them with the servo tester and they work fine. I plugged some other servos in to the receiver, some S3151 and some S3001 and they work fine with the transmitter. I replaced the receiver with a known good FrSky receiver and the servos in the wing do not work. I have run out of ideas of where to look for the problem. Everything seems to work fine except those S9101 servos will not answer the signal from the transmitter. Anyone have any ideas?