What was found
IN CLIMB OUT, KEPT INCREASING FLOW TO MAINTAIN DESIRED CAB PRESS FOR F L330. APPROX 5 MIN AFTER REACHING FL330 WE LOSSED CONTROL OF BOTH AUTO AND MANUAL CAB CONTROL. CABIN REACHED FL230 RAN CHECKLIST AND DESEN DED TO FL230. FOUND AIR LEAK AT THE NR 3 PIT DOOR. CHECKED DOOR SEAL & EXTERNAL LATCHING MECH. FOUND LOWER DOOR HOOK RIDE UP ON TEE BOLT IF DOOR NOT SHUT RIGHT (REF LP023577) DEFERRED M263884. REF LP 23583 - RERIGGED DO OR PER MM 52-31-00 OPS CHECK GOOD, THIS CLEARS M263884.