What was found
EMERGENCY DECLARED, A/C LANDED UNEVENTFULLY, A/C OOS, LEVEL 3, CABIN ALT. CW FIM 21-33-00 AND AMM 21-31-00. NO DEFECTS NOTED. Q-ALERT ISSUED; TO REPLACE PN 2119704-1 AND 21199702-4. REF Q-ALERT. PRESSURIZED A/C, NO MESSAGE FOUND. OPS CK GOOD, NO FAULTS PER FIM 21-33-00 AMM 21-31-020. REPLACED CABIN PRESSURE CONTROLLER AND CABIN PRESSURE SELECTOR ASSEMBLY IAW M 21-31-06 & 21-31-04, OPS CHECK GOOD. ORIG SUB DATE: 9/26/2022