As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT ON TAXI IN. APU RAN UP TO APPROXIMATLY 26%, THEN SPOOLED DOWN AGAIN.(<P>ITEM# 2 - AT APU START UP FOUND APU BATTERY VOLTAGE DROP BELOW 16V, AND AFTER APU @ 50% AMPERAGES WAS + 65 AMP. R&R APU BATTERY IAW AMM 24-31-04.</P> / <P>LOG # 1369479 - ITEM# 4 - R&R APU BATTERY CHARGER IAW AMM 24-31-05. OP'S CHECK GOOD. APU RUNS NORMAL AT THIS TIME.</P>)