What was found
ON DESCENT 'RT WING OVHT' ANNUNCIATOR ILLUMINATED WITH RIGHT ANTI-ICE SWITCH IN THE OFF POSITION. REDUCED RIGHT ENGINE POWER TO IDLE AND ANNUNCIATOR EXTINGUISHED. MAINTAINED RIGHT ENGINE AT IDLE POWER AND ACCOMPLISHED SINGLE ENGINE APPROACH IN ACCORDANCE WITH CHECKLIST. EMERGENCY WAS DECLARED. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED A FAULTY RIGHT WING ANTI-ICE BLEED AIR PRESSURE REGULATOR SHUTOFF VALVE. GROUND OPERATIONAL CHECKS PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.