What was found
(AIRCRAFT GROUNDED) AIRCRAFT WONT PRESSURIZE CABIN CLIMBED WITH ALTITUDE, PER TSM 21-31-00-810-808-A REMOVED AND REPLACED CABIN PRESSURE SAFETY VALVE AT 7HL IAW AMM 21-31-52-400-001-A. PER TSM 21-31-00-810-808-A REMOVED AND REPLACED CABIN PRESSURE SAFETY VALVE AT 6HL IAW AMM 21-31-52-000-001-A AND 21-31-52-400-001-A. OPS CHECKS GOOD. REMOVED AND REPLACED SDAC 1 REF AMM 31-55-34-000-001-A, FOR REMOVAL. REF AMM 32-55-400-001-A, FOR INSTALLATION. OPS CHECKED GOOD, REF AMM 31-50-00-710-001. REMOVED AND REPLACED CPC-1 REF AMM 21-31-34-000-001-A REMOVAL. REF AMM 21-31-34-400-001-A INSTALLITION. OPS CHECKED GOOD REF AMM 21-31-00-710-002.