As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALTITUDE AUTO DROP TEST FAILED. REMOVED AND REPLACED ALTITUDE PRESSURE SWITCH, IAW AMM 35-22-41. OPERATIONS CHECK GOOD, IAW AMM 35-22-41. WORK ACCOMPLISHED BY AAR ROCKFORD MECHANIC V931575. THIS TEST WAS PERFORMED AS PART OF THE RETURN TO SERVICE PROCESS.