What was found
UNABLE TO CONTROL CABIN PRESS, DIVERTED. CHECKED RIG OF OUTFLOW VLV & OUTFLOW BUTTERFLY VLV, NO DEFECTS NOTED. FOUND OUTFLOW VLV BINDING IN AUTO & MANUAL DUE TO EXCESSIVE PAINT BUILD UP ON OUTFLOW VLV NOZZLE IAW MM 21-32-05. REMOVED PAINT BUILD UP, PREPPED & PRIMED IAW SRM 51-10-3B. PERFORMED OPERATIONS CHECK OF OUTFLOW VLV & OUTFLOW BUTTERFLY VLV. OPERATIONS CHECKED NORMAL IAW MM 31-32-05.