What was found
IN STANDBY, WING OVERHEAT MASTER WARNING AFTER TAKEOFF, BOTH WINGS. COMPLIED WITH QRH, MSG CLEARED, NORMAL CONTROL ON MEL. DECLARED EMER & DIVERTED. R & R WING ANTI-ICE CONTROLLER IAW AMM 30-12-00. OPERATIONS CHECKED & RAN ACFT WITH CREW, STBY MODE WORKS NORMAL. NORMAL MODE STILL INOPERATIVE & ON MEL.