What was found
SEA FLIGHT NR 2392: AFTER START UP, PROP DEICE CAUTION LIGHT ILLUMINATED. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE INTERROGATED CDS. NO PROP DEICE FAULTS NOTED. CLEARED NR 1 AND 32 PROP DEICE NVM. PERFROMED FUNCTIONAL TEST OF THE PROP ICING SYSTEM IAW Q400 AMM 30-61-00, PAGES 501-502. FUNCTIONAL TEST GOOD. PROP DEICE CAUTION LIGHT DID NOT ILLUMINATE. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.