What was found
DISC: AFTER TAKEOFF CABIN ALT PRESSURE WAS AMBER AND ROSE WITH THE AIRCRAFT. IT LEAKED AT ABOUT 9800FT AND THE AIRCRAFT ALTITUDE WAS APPROX 11.3FT. THAT DESCENDED BACK TO 10000FT AND THE CABIN ALT HELD WITHIN 200FT WHATEVER ALT THEY WERE AT. CORR ACTION: COMPLETED PRESSURIZATION CHECK OPS TESTED GOOD ON THE GROUND. ON 6/3 HAD ANOTHER ISSUE PRESSURIZING ON THE GROUND FOUND AC GROUND CONNECTION FLAPPER STICKING OPEN DUE TO BROKEN HINGE. R&R'D FLAPPER VALVE.