What was found
FLT 3822 - RECEIVED A TRIPLE CHIME AND "NOSE DOOR OPEN" WARNING MESSAGE CLIMBING THRU 9,000'. REPLACED MLG SELECTOR VALVE IAW 32-32-10 AS WELL AS MANUAL BYPASS AND RUNAROUND VALVE IAW 32-32-2. OPS CHECK GOOD, PN: 750004000-003, SN OFF: 058, PN: 750005000, SN OFF: 0740.