What was found
(CAN) AIRCRAFT EXPERIENCED AN UNCOMMANDED DECOMPRESSION ON CLIMB (14 200 FEET) AND RETURNED TO THE DEPARTURE AIRPORT. FILE WILL BE UPDATED PENDING FINAL RESOLUTION. AIRCRAFT WAS RELEASED FOR SERVICE UNDER MEL FOR UNPRESSURIZED FLIGHT. UPDATE SDR FEB 02, INSPECTION FOUND AFT CARGO DOOR SEAL DAMAGED. REPLACED AFT CARGO DOOR SEAL WITH SERVICABLE PN 8SC0940-003 ON JAN 31ST (TC# 20150130006)