What was found
RT PROP FAIL. WITH PROP ICE SELECTED ON CREW GOT MASTER CAUTION ON BOTH SIDES 40 SECONDS AFTER SELECTED TO NORM AND ABOUT 10 SECONDS WHEN SELECTED TO MAX. ALL DE-ICE CHECKS NORMAL ON GROUND. COMPLIED W/QRH, RESET ALL C/B, NO CHANGE ON DESCENT INTO DTW. THE LT SIDE APPEARED TO WORK NORM WHILE RT FAILS. MAINTENANCE RAN BOTH LT AND RT PROP HEAT IN MAX FOR APPROX 6 MIN AND IN NORM FOR 6 MIN WITH NO FAIL OR MASTER CAUTION LIGHTS. BOTH BRUSH BLOCKS AND LEADS LOOK GOOD. ALL CHECKS GOOD AT THIS TIME.