What was found
OAK - FLIGHT CONTROL - FLT 621 - CREW REPORTED THAT DURING APPROACH INTO OAK THE FLAPS WOULD NOT EXTEND BEYOND 10. CREW PERFORMED GO AROUND AND FOLLOWED QRH, FLAPS REMAINED AT 10. EMERGENCY EQUIPMENT WAS CALLED FOR PRECAUTIONARY PURPOSES, LANDED AT OAK WITHOUT FURTHER EVENT. MAINTENANCE CLEANED FLAP INDICATOR CANNON PLUG. REMOVED AND REPLACED FLAP INDIACTOR. PERFORMED FLAP OPERATIONAL TEST, OPS CHECK WAS GOOD. FLAPS WERE REPORTED FOR MAKING GRINDING NOISE. TRAILING EDGE FLAP MOTOR WAS REPLACED. OPERATIONAL CHECKS WERE GOOD.