What was found
AFTER T/O MAIN CARGO DOORS FAILED UPLATCH CK RAN CHECKLIST WITH NO HELP RETURN TO DAY AS PER OPS AND MX CONTROL. PERFORMED OP CK OF MLG DOOR FLT LOCKS, LUBED FLT LOCK, MLG DOOR UPLATCH CK OPS CKS NORMAL AT THIS TIME COULD NOT DUPLICATE ON GROUND NO LEAKS OR DEFECTS NOTED.