What was found
(EMERGENCY DECLARED) CRUSE ATT 370 RECEVED RED ECAM CAB PR. EXCESS CAB ALT. CAB PR SYSTEM 1 FAULT. EMERG DESCENT TO FL 260. PRESSURE IN CABIN NEVER EXCEDED 8 PRO FT. RAN QRH TRIED MANUALMODE. KEPT GETTING RED CAB PR EXCESS CAB ALT ECAM / REF W/O 417433 FOR ALL T/S AND WORK ACCOMPLISHED, OFV WAS REMOVED/REPLACED, #2 CPC WAS REMOVED/REPLACED, OPS CK'S WERE ACCOMPLISHED REF AMM 21-31-00-710-002 AND AND AMM 21-31-00-710-003. PER MOC, AIRCRAFT IS OKAY FOR RETURN TO SERVICE"