As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LCR IRS DC FAIL ANNUNCIATOR LIGHTS ILLUMINATED IN FLIGHT. EMERGENCY DECLARED AND RETURNED TO DEPARTURE. UNEVENTFUL LANDING. AIRCRAFT WAS GROUNDED. MAINTENANCE ACCOMPLISHED MCM WORKCARD 05-96-12 AND REPLACED THE MAIN BATTERY AND CHARGER IAW AMM 24-31-02. PERFORMED SATISFACTORY OPERATIONAL CHECK.