As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, NR 1 ENG WAS SPARKING FROM PROP SPINNER WITH PROP HEAT ON AND NR 1 AC GENERATOR "A" PHASE AT 85 VOLTS. SELECTED PROP HEAT OFF AND SPARKS STOPPED. ON GROUND NR 1 "A" PHASE WAS 103 VOLTS. R & R NR 1 BRUSH BLOCK ASSY. REFERENCE IAW 30-61-00. R & R ONE CURRENT LIMITER IN LT AC CONTACTOR BOX. GROUND RAN ACFT, OPS CHECKED GOOD.