What was found
IAH- FLIGHT 3821, WHEN GEAR IS RETRACTED LOUD THUMPING IS HEARD FROM ALL THREE (3) WHEELS. GEAR DOES NOT RETRACT FULLY, EVEN AFTER THIRTY (30) SECONDS AND FLAPS DO NOT COME UP AS WELL. WHEN HANDLE IS CYCLED GEAR FALLS WITH LOUD THUMP. WHEN RETRACTED FOR THE SECOND TIME SAME THUMPING, BUT EVENTUALLY DOES RETRACT. MAINTENANCE CLEANED MOISTURE AND DEBRIS FROM NOSE WHEEL WELL INTERCONNECT CANNON PLUG. PERFORMED GEAR SWING, OPERATIONAL CHECK GOOD. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.