My roll servo went out prior to first flight and I had to do the same thing. I rang out the wires and knew they were good but Dynon wanted me to do the swap.
To make things easier, I made another servo harness so I could just plug the pitch servo wiring into the roll servo. Same problem so it went in for repair and came back working like new.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army