What was found
LOST PRESSURAZATION IN FLT AT FL380 ACCOMPLISHED AUTO CABIN PRESSURE CONTROLLERS TEST IAW AMM 21-31-00-705-085 NO FAULTS NOTED TEST PASSED, ACP MANUAL MODE CONTROL TEST IAW AMM 21-31-00-715-001 NO FAULTS NOTED TEST PASSED,ACP CABIN PRES OUTFLOW VALVE INSPECTION/CHECK FOUND NORMAL IAW AMM 21-31-03-202038. PRESSURIZED ACFT WITH APU TO 6PSI DIFF PRESSURE HELD FOR 10MINS NO FAULTS NOTED. REMOVED AND REPLACED CABIN PRESSURE OUTFLOW VALVE IAW AMM 21-31-03-402-010. R & R OVERBOARD EXHAUST VALVE IAW AMM 21-58-05. OPS CHECK GOOD. REMOVED AND REPLACED RELAY K10442. SYSTEM OPS CHECK GOOD IAW 21-58-05-700-801.