What was found
CAB PR SYS 2 FAULTECAM DISPLYED ON POST FLIGHT REPORT , FOUND PRESS CONT. 2 21-31-34 MSG . PERFORMED OPERATIONAL TESTS OF CPC 1&2 . ALL TESTS PASSED AFTER RESET OF CPC 2 . REQUEST DEFFERAL OF CPC2 . PULLED C/B FOR CPC 2 . PLACARDED . MEL 2131B PLEASE CHANGE CABIN PRESSURE CONTROLLER 2 THANKS PER TOMC CONTROLLER , REQUEST US CHANGING CPC 2 CONTROLLER .. REMOVED AND REPLACED CABIN PRESSURIZATION CONTROLLER PER TOMC. REF AMM 21-31-34-400-001-A . PERFORMED OPS TEST OF PRESS. CONTROLLERS 1&2 . BOTH TESTS PASSED . P/N ON - 9022-15702-10 S/N 3412. P/N OFF - 20791-02AB S/N 4488. OK FOR SVC . ADD EMP:U221991 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1346753 SN OFF 4488 CONTROLLER, CAB OFF 31-2130-9-0001 4488 ON 31-2130-9-0001 3412