What was found
WHEN COMPLETING BEFORE LANDING CHECKLIST, FLAP HANDLE SELECTED TO 30, FLAP INDICATOR NEEDLE INDICATED 8 + 10 DEGREES. ON THE GO AROUND, THE FLAP NEEDLES MATCHED AT 10 DEGREE. COMPLETED THE QRH PROCEDURE, USING ALTERNATE FLAP MASTER SWITCH AND ELECTRICALLY MOVED THE FLAP TO 15 DEGREE. AIRCRAFT LANDED WITHOUT FURTHER PROBLEM. COMPLIED WITH FIM 27-51, TASKS 813 AND 836, NO FAULT/INTERMITTENT. PERFORMED FSEU BITE TEST, NO FAULTS NOTED CURRENT/HISTORY. AS PRECAUTION, REPLACED LH FLAP POSITION TRANSMITTER PER AMM. PERFORMED MULTIPLE FLAP CYCLES, FLAP POSITION SENSOR TESTED GOOD. AIRCRAFT RETURNED TO SERVICE.