What was found
AT ABOUT 3,000 FEET DURING CLIMB-OUT, CREW COULD NOT COMPLETE THE UPLATCH CHECK. COM PROCEDURES COMPLIED WITH AND AFTER NUMEROUS GEAR OPERATION AND INDICATION PROBLEMS, THE AIRCRAFT LOST PRESSURIZATION AT 13,000 FEET. PER A FILED ASR, THE CREW DECLARED AN EMERGENCY, DESCENDED TO 10,000 FEET, AND RETURNED TO DTW. CABIN OXYGEN MASKS DID NOT DEPLOY AND THE LANDING WAS UNEVENTFUL. MAINTENANCE RESERVICED THE NOSE LANDING GEAR STRUT AND ADJUSTED THE GEAR DOOR LATCH MECHANISM ROLLER ASSEMBLY TO HOOK CLEARANCE. AIRCRAFT RETURNED TO SERVICE.