I wasn't getting a pitch trim indication for the trim tab on the EFIS. The flaps and the trim tabs use the same calibration method in the VPX. The flaps calibrated with no problem, but the pitch trim would not show any variability in the resistance. I was able to isolate the problem to the wire between the servo and the connector behind the panel. I was able to use the old wire to fish the new wire through the fuselage out the tail and rewire the servo. After doing so, the VPX calibration process was completed.
