As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA FLIGHT NR 2271: PITOT HEAT STBY, DEICE TIMER, DEICE PRESSURE ILLUMINATED AFTER PUSH AND PROPS AT MAX. ALL BUSSES POWERED NORMALLY. DEICE PRESS 18 PSI. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE REMOVED AND REPLACED TIMER AND MONITOR UNIT IAW Q400 AMM 30-11-01, PAGE 401-406. NO REOCCURRENCE OF ABOVE MENTIONED CAUTION LIGHTS. AIRCRAFT RETURNED TO SERVICE.