As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT APU SHUTDOWN TWICE BEFORE ENGINE START. AIRCRAFT LOST ALL POWER(<P>TRANSFERED TO MDDR 146581 IAW MEL 49-11-01A.</P><P>LP 1248086: ECU BITE TEST SHOW REVERSE FLOW. PER FIM 49-11-994. INSPECTED AND TEST SURGE CONTROL FILTER. OK. APU OPERATIONAL CHECK WITH A BLEED LOAD. SYSTEM NORMAL PER AMM 49-11-00/201, CLEARED MDDR 146581. MCC NOTIFIED. A/C OK FOR SERVICE.</P>)