What was found
APU WILL NOT START (AT START, FAULT FLASH ONCE, RUN FLASH TWICE) NO VOLTAGE DROP OR STARTER ENGAGEMENT. TRANSFERRED TO MDDR 141330, IAW MEL 49-11-01A, CAT C. TS PER FIM 49-11 FT 959. DURING TS NOTICED LOW APU BAT VOTAGE. REMOVED AND REPLACED APU BATTERY, IAW AMM 24-31-04 (OFF PART: PN 4-254-03, 1938). PER MCC REQ REPLACED APU BATT CHARGER, IAW AMM 24-31-05. OPERATIONS CHECK GOOD. NO FUTHER DEFECTS NOTED AT THIS TIME. THIS CLEARS MDDR 141330.