What was found
CREW LOST CABIN PRESS, RTFL LEFT OUTFLOW VALVE FAILED & CABIN ALT HORN CAME ON AT 10000 FT. CREW LOST THE CABIN, DESCENDED TO 8000 FT RT OUTFLOW VALVE WOULD NOT MAINTAIN CABIN PRESS. INVEST FOUND MAINT MESS 21207 DISPLAYED & LATCHED HARD. REF MAINT MESS 21207 CPCS OUTFLOW VALVE L ACTUATOR MOTOR FAIL FIM TASK 21-31 TASK 807. INSP LT & RT OUTFLOW VALVE ASSY, LT & RT ICU & P213 LEFT OFV COMPONENTS. NO FAULTS NOTED 164022 CARRIED OUT FUNCTION CHK OF LT & RT OUTFLOW VALVES. BOTH OPERATED NORMALLY & SMOOTHLY WITH NO DEFECTS NOTED. BOTH CPCS SYS PASS BITE TESTS OK. RPLCD THE R349 & R351 RELAYS AS PER FIM TASK. RPLCD LT OUTFLOW VALVE MOTOR ASSY AS PER MM WITH BORROWED PART. ALL OPERATES AND FUNCTIONS NORMALLY.