What was found
DURING HEAVY MAINTENANCE: PRESSURIZATION WILL NOT EXCEED 4.4 GOT EXCESSIVE CAB. ALT OUT OF FL210.; REPAIRS ACCOMPLISHED UNDER STS WO# 003031.REF. LOG PAGE # 3719161, ITEM 1(THIS AIRCRAFT, AIRFRAME, AIRCRAFT ENGINE, PROPELLER, OR APPLIANCE IDENTIFIED ABOVE WAS REPAIRED AND INSPECTED IN ACCORDANCE WITH WO# W003031 AND CURRENT REGULATIONS OF THE FEDERAL AVIATION AGENCY AND IS APPROVED FOR RETURN TO SERVICE. DETAILS OF THE REPAIR ARE ON FILE AT STS AVIATION SERVICES U.S CRS#1E1R898B.).'