What was found
(CAN) MAINTENANCE REPORT: AFTER LANDING, FLAP DRIVE CAUTION LIGHT ILLUMINATED DURING FLAP RETRACTION. FLIGHT CREW COULD SEE THE PRIMARY DRIVE SHAFT WAS DISCONNECTED AT L/H NR2 BALL SCREW ACTUATOR OUTBOARD SPUNE CONNECTION. (MECHANICS WERE DISPATCHED TO MINAMI TO INSPECT/RE-CONNECT AND RIG FLAP SYSTEM - NO DAMAGE FOUND AND AIRCRAFT RETURNED TO SERVICE). CAUSE: ON OCTOBER 23-27 THE A/C UNDERWENT 3RD PARTY SERVICING - TASK 2750/02 - LUBRICATION OF FLAP PRIMARY TO SHAFT SPUNES - MAINTENANCE DID NOT INSTALL THE THROUGH BOLT AT L/H NR2 BALL SCREW ACTUATOR OUTBOARD SPLINE CONNECTION CORRECTLY.