What was found
WING OVERHEAT MASTER CAUTION RT WING AFTER COMPLETEING QRH EMERGENCY 12-2 WING OVERHEAT WARNING CONTINUED TO PERSIST AND WOULD NOT CLEAR. IN LAST 8 MINUTES OF FLIGHT WARNING CLEARED. MAINTENENCE FERRIED TO RDU. PERFORMED OPS CHECK TEST OF WING ANTI-ICE CONTROL AND INDICATION SYSTEM PER AMM 30-12-00-710801. NO DEFECTS FOUND, NO FAIL OR FAULT INDICATIONS. REMOVED AND REPLACED SUSPECTED BAD ANTI-ICE TEMP CONTROLLER (HOLDING ORIGINAL CONTROLLER FOR TROUBLESHOOTING). SYSTEM OPS CHECKED GOOD IAW AMM 30-12-00. NO DEFECTS.