As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PROPELLER DEICE CAUTION LIGHT ILLUMINATED IN FLIGHT. INITIALLY, IT WAS FLASHING INTERMITTENTLY, BUT BECAME MORE STEADY OVER TIME, AND IT SEEMED TO BE TRIGGERED BY THE NR 1 PROP. DIVERTED AND ACCOMPLISHED A UNEVENTFUL LANDING. NR 1 PROP SLIP RING CLEANED AND PROP BRUSH BLOCK REPLACED. FUNCTIONAL TESTED IAW AMM 30-61-00-720-801. NO DEFECTS NOTED. NO FAULTS IN CDS. RETURNED TO SERVICE.