As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIREP DURING CLIMB REACHING 360 CABIN PRESS EXCESS CABIN ALT WAS PRESENTED & CABIN PRESS SYS 2 & DURING DESCEND CABIN PRESS LOW DIF PRESS WAS PRESENTED. IAW AMM 21-31-00-040-006-A DEACTIVATION CPC 2 WAS PERFORMED IN NORMAL CONDITION TEST OK, CB Y22 IS POSITION OPEN. THIS ITEM DEFERRED TO DMI 451 MEL 21-31-01-2 CAT C MEL PROCEDURE ACCOMPLISHED. PRESSURE CONTROLLER 2, 12HL, MUST BE REPLACED.