What was found
(CAN) INITY MAINT NOTIFIED THAT WHEN SELECTING FLAPS TO UP POS (ON GROUND) THAT FLAP IND. SHOWING 20 DEGS&THAT FLAPS WERE NOT ABLE TO RETRACT ANY FURTHER. MAINT FOUND L/H INBOARD FLAP IN APPROX. 25DEGS DOWN POS,&THAT FLAP SPLIT SYS PREVENTING FURTHER FLAP-MOTOR OP. ALL FLAPS WERE MANU RETRACTED&CONFIRMED LOCKED IN UP POS. A/C DISPATCHED AS PER MEL PROCEDURE FOR FLAP-UP OPS.DURING T TROUBLE-SHOOTING IT FOUND THAT L/H INBOARD FLAP ACTUATOR ASSY FAILING, INTERNALLY. GEAR INTERNALLY OF DRIVE ASSY, WHICH IS PART OF FLAP ACTUATOR ASSY FOUND WORN WITH SECTION OF GEAR BROKEN OFF.L/H INBOARD FLAP ACTUATOR REPLACED BEFORE FURTHER FLT.