As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG FLIGHT NR 2357: AFTER PUSHBACK, ENGINE START, PROP DE-ICE CAUTION LIGHT ILLUMINATED. MAINTENANCE COMPLIED WITH PROCEDURE IAW DH8-SL-31-001R14 PER MTX CONTROL. CAUTION LIGHT EXTINGUISHED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.