What was found
AFTER FERRY FLIGHT (LFBO-BIKF-KPHL), THE FLIGHT CREW REPORTED THAT THE AIRCRAFT EXPERIENCED MINOR PITCH CHANGES & VIBRATION DURING THE FLIGHT. MAINTENANCE REPLACED THE NR 2 ELAC (ELEVATOR AILERON COMPUTER) AND STILL RECEIVED A F/CTL ELAC 2 PITCH FAULT. MAINTENANCE ALSO REPLACED THE ELEVATOR SERVO CONTROL ACTUATOR VALVE AND FAULT WAS STILL INTERMITTANT. FURTHER TROUBLESHOOTING IDENTIFIED THE SOURCE OF THE DIFFICULTY, WHICH WAS A LOOSE SCREW (IMPROPERLY SECURED) ON CONNECTOR 24VC, LOCATED IN 80 VU. AFTER INSPECTING & RESECURING THE CONNECTOR AND OPERATIONAL CHECKS, NO FURTHER FAULTS WERE DETECTED. A MAINTENANCE ACCEPTANCE FLIGHT WAS ACCOMPLISHED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.