As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6418 - PHX-COS - RETURNED TO PHX DUE TO AIRCRAFT WOULD NOT PRESSURIZE IN FLIGHT. AFTER AN UNEVENTFUL LANDING MAINTENANCE WAS CALLED. MAINTENANCE FOUND A BAD PUSH ROD ASSY IN MAIN CABIN DOOR. MAINTENANCE REPLACED THE PUSH ROD. OP CHECKS GOOD. (M)