As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE WARNING SYSTEM FAILED INITIAL TEST IAW NEW 12 MONTH INSPECTION REQUIREMENT OF MM, CHAPTER 5. DURING SUBSEQUENT TROUBLESHOOTING, FOUND WIRE D34A22 CONNECTED TO NC TERMINAL OF ALTITUDE SWITCH S117 INSTEAD OF C TERMINAL AS SHOWN IN WDM 21-30-01 P.3. EVIDENCE WIRING IN AREA DISTURBED PREVIOUSLY DURING AVIONICS MODIFICATIONS OR INTERIOR REFURBISHMENT.