What was found
FLT#1924, STI-BOS. (AIRCRAFT PERFORMED AN AIR TURN BACK TO STI AND DECLARED AN EMERGENCY) ' CABIN TEMP 96 DEG F ON CLIMB WHILE USING PACK 1 REF LP 3656595, ITEM 1 (PRESS CABIN ALTITUDE HIGH WARNING IN FLIGHT CLIMBING THROUGH 18K CABIN PRESSURE CLIMBED TO 11'000, TEMP TO 96 F. ( MANUAL CABIN PRESSURE CONTROL SYSTEM )). PACK 2 WAS PREVIOUSLY PLACED ON MEL REF MDDR 516413 ( PACKS ); REF LP 3664451, ITEM 1 FOR CORRECTIVE ACTION OF PACK 2. FOUND FCV ON #1 PACK AT FAULT FOR PACK 1 FAIL. REMOVED AND REPLACED PACK 1 FCV PER AMM 21-51-51. OPS AND LEAK CHECK OK AT THIS TIME. NO FURTHER FAULTS FOR PACK SYS WERE NOTED. OK FOR CONT SVC. MDDR 516416 CLEARED. MX-4 UPDATED. PLACARD REMOVED.'