What was found
GEG FLIGHT NR 2160, BOTH PROP HEATS INOP. MAINTENANCE PERFORMED FUNCTIONAL CHECK OF PROP DEICE SYSTEM IAW AMM 30-60-00, PAGES 501-503. CHECKS GOOD. LOADS ALL ABOVE 20, EACH BLADE PAIR, ABOVE AND BELOW -10 DEGREES. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.