What was found
LEFT FAN BYPASS CHECK VALVE DOOR MISSING IN THE PRIMARY PLENUM/DIFFUSER ASSEMBLY. IPC 21-51-03-06A-50. INSPECTED LT PACK REF. FIM 21-53 TASK 820 FOUND LEFT FAN BYPASS CHECK VALVE MISSING IN THE PRIMARY PLENUM - DIFFUSER ASSEMBLY. DOOR MISSING, STARTED TO PERFORMED REMOVAL OF THE HEAT EXCHANGER AND PLENUM - DIFFUSER ASSEMBLY IAW AMM 21-51-03-000-805-002 UP TO G STEP 5. FOR THE LT PACK. CONTINUED REMOVAL OF LT PACK HEAT EXCHANGER AND PLENUM - DIFFUSER ASSEMBLY IAW AMM 21-51-03-000-805-002 STARTING FROM STEP G.(5) TO COMPLETION. INSTALLED NEW PRIMARY HEAT EXCHANGER & PRIMARY DIFFUSER AND PLENUM IAW AMM 21-51-03-400-804-002. CYCLED AND RAN LT PACK FOR SEVERAL MINUTES WITH NO LEAKS OR FURTHER FAULTS DETECTED.