As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF THE CAPTAIN LOST MAP, TR1 IN AMBER WITH THE LOSS OF NAV1 & INTERMITTENT LOSS OF NAV SYS ON CAPTAINS SIDE. CREW REPORTS LOSING THE NR 1 BATTERY WITH VOLTAGE AT 23VDC & DECREASING. ON ARRIVAL NR 1 BATTERY VOLTAGE WAS IN AMBER WITH 95 AMP SHOWING. DC BATTERY WAS IN AMBER COLOR TOO. REPLACED BATTERY NR 1 IAW MM TASK 24-38-51-000-001-A. ALL INDICATIONS NORMAL.