What was found
CLIMB OUT, 25,000 FT #2 WING BODY OVERHEAT LIGHT DID QRH LIGHT REMAINED ILLUMINATED. GROUNDED - YES. DIVERSION TIME 42 MINUTES - FOUND NO ACTIVE FAULTS RECORDED ON THE CODCU. VISUALLY INSPECTED THE ELEMENTS ASSOCIATED WITH FAULT 64 (FROM T/S ENTRY), AND FOUND M1764 VERY CORRODED. REPLACED ELEMENT M1764 PER B737-800 AMM 26-18-02/401. OP-CHECKS GOOD PER SAME. NOTE: THE REMOVED M1764 ELEMENT HAD A 1M OHM SHORT FROM INNER TO OUTER SECTIONS, WHICH FLUCTUATED WITH ANY MOVEMENT OF THE ELEMENT. THIS CLEARS MEL 26-13B.