What was found
DURING CLIMB OUT AT APPROX 17,000FT "AUTO FAIL" LIGHT ILLUMINATED, SELECTED "ALTN" PER QRH. SYSTEM APPEARS TO OPERATE "NORMAL" IN "ALTN" MODE. GROUNDED - YES. PERFORMED FIM 21-31 TASK 827, DCPC BITE PER FIM 21-31 TASK 801, FOUND OFV FAULT, CLEARED FAULT ON DCPC AND SYSTEM CHECKED NORMAL. AUTO FAIL LIGHT EXTINGUISHED, A/C OK FOR SERVICE. TSR ISSUED. REMOVED AFT OUT FLOW VALVE ASSY REF MM 21-31-03-000-801. INSTALLED NEW AFT OUTFLOW VALVE REF MM 21-31-03-400-801 STEP 3 F (I) THROUGH (11). INSTALL TEST OF S/N 9719709 FAILED. NR 1 PRESSURE CONTROLLER SHOWS OFV LRU FAIL FAULT CODE 009 AS ACTIVE FAULT. COMPLETED FIM TASK 21-31 TASK 802. REMOVED S/N 9719709 AND INSTALLED S/N 0012501 REF AMM 21-31-03-400-801 OPS CHECKS NORMAL. NO FAULTS NOTED. GROUND VERIFICATION SUCCESSFUL.