As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE FLIGHT AURAL WARNING HORN SOUNDED AND AT THE SAME TIME ALL OR THE CAUTION AND WARNING LIGHTS ILLUMINATED, CHECKED ROTOR RPM, ENGINE PARAMETERS AND AIRSPEED/ ALTITUDE. THE ACFT WAS OPERATING NORMALLY, RETURNED TO BASE, RELEASED TO MX.