As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A, DIVERSION - BOTH ATC TRANSPONDER MODE C FUNC INOP. ATC REQUIRED DIV TO STN. *S/D* SWAPPED POSITIONS OF ATC TRANSPONDERS IAW 34-54-01. PERFORMED BITE CHECK ON BOTH ATC TRANSPONDERS CHECKED OK AS PER AMM 34-54-00 (OPERATIONAL TEST) POSITIONS OF X-PONDERS ATC 2 P/N 7517800-10004.