What was found
CREW REPORTED CABIN WOULD NOT PRESSURIZE ON CLIMBOUT. DELTA-P WAS 0.1 TO 0.2. ATTEMPTED MANUAL PRESSURIZATION PROCEDURE WITHOUT SUCCESS. CREW RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. NO EXCESSIVE NOISE OR SQUEALING FROM ANY DOORS WAS REPORTED BY CREW. MAINTENANCE CHECKED MDC (MAINTENANCE DIAGNOSTIC COMPUTER). NO FAULTS LOGGED. MAINTENANCE PERFORMED FUNCTIONAL TEST OF CPC (CABIN PRESSURE CONTROLLER) AND PERFORMED MANUAL PRESSURIZATION TO DELTA-P 4.0 PSI USING AIRCRAFT MAINTENANCE MANUALS. OPERATIONAL CHECKS GOOD AND NO DEFECTS NOTED. AIRCRAFT RELEASED FOR SERVICE.