As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT, CREW SAW SPARK AND HEARD POP COMING FROM THE WHISKEY COMPASS. COPILOT EXTENDING COMPASS AND RECEIVED SMALL SHOCK. NO FURTHER ARCING AND NO DEFECTS WERE NOTED FOR REMAINDER OF DESCENT. DELTA MTC FOUND WHISKEY COMPASS LIGHTING WIRE SHORTED TO LT ENG IGNITION WIRE. SPLICED BOTH WIRES AND REPLACED DAMAGED TERMINAL. WHISKEY COMPASS LIGHTING AND ENG IGNITION OPS NORM.