As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6578 - IAD-PWM - DURING CRUISE, MADE UNSCHEDULED LANDING AT IAD DUE TO PROP DE-ICE FAILURE, ELEVATOR HORN ICE FAILURE, AND STALL WARNING TAPE SHOWS STALL INDICATION. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED ELEV HORN, DE-ICE FUSE AND INSPECTED STALL WARNING. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. REFERENCE VTZA96275.