What was found
CREW REPORTED AT 6000 FT, CABIN PRESSURE LIGHT ON ECAM. AT 8000 FT, CREW RECEIVED A MASTER CABIN PRESSURE LIGHT. UNABL E TO CONTROL THE PRESSURIZATION AS CABIN CLIMBED. NEVER ASSENDED ABOVE 10000 FEET. TROUBLESHOT IAW TSM 21-31-00-810-831-A, AND FOUND A CPC1 FAULTING. REPLACED CPC1 IAW AMM 21-31-34-400-001-A. OPS TESTED IAW AMM 21-31-00-710-002 -A, BOTH SYSTEMS 1 AND 2 CHECKED OK. SYSTEM OK FOR SERVICE.