As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEG - ON TAXI FOR FLIGHT 4309, RECEIVED A APU BATT CHARGER STATUS MESSAGE. RETURNED TO THE GATE. APU BATTERY REPLACED ON WC 310ME2470051 DATED 01-19-06 BATTERY BAD FROM STOCK. REINSTALLED ORIGINAL BATTERY IAW AMM 24-32-03 CHECKS GOOD STATUS MESSAGE CLEARED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.