What was found
DURING C/W SB 750-27-11, BOTH AILERON PCU'S WEEPING HYD FLUID. PCU'S REPLACED AND SB ACCOMPLISHED. ACFT RIGGED AND TESTED IAW CE750 MM. ON NEXT FLT, COCKPIT EICAS MESSAGES INDICATED AILERON PCU RIGGING INADEQUATE. HYD SERVICE UNIT RE-INSTALLED, RIGGING RE-CHECKED AND FOUND IN C/W PUBLISHED MM PROCEDURES. NOTICED BEAMS SUPPORTING PCU'S FLEXING. THREE OF 11 FWD BEAM BOLTS, WHICH MOUNT INTO NUT PLATES, HAD NO TORQUE DUE TO STRIPPED NUT PLATES. PER CESSNA, REMOVED NUT PLATES AND REINSTALLED BOLTS WITH NUTS. THIS DID NOT SOLVE RIGGING DILEMMA. USE OF PROTOTYPE DATA MONITOR UNIT ALLOWED FINE-TUNING OF THE RIGGING OF THE PCU'S. ACFT TEST FLOWN AND FOUND TO OPERATE NORMAL IN ALL REGIMES OF FLIGHT.