What was found
SEA - ON FLT NR 2047, RT TRU CAUTION MESSAGE, ALSO NR 2 SPU AUX POWER AND RT STALL WARNING ILLUMINATED AT THE SAME TIME. RT STALL WARNING WAS INTERMITTENTLY ILLUMINATING ON AND OFF THROUGHOUT FLT. MAINTENANCE FOUND NR 2 PROP BRUSH BLOCK BURNED/ARCHED. REMOVED AND REPLACED BRUSH BLOCK. PERFORMED FUNCTIONAL TEST OF PROP DE-ICE SYSTEM. RESET RT TRU CIRCUIT BREAKER. NO OTHER DEFECTS. PERFORMED STALL WARNING TEST, NO DEFECTS NOTED. ALL CAUTION LIGHTS EXTINGUISHED. AIRCRAFT RETURNED TO SERVICE.