As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU AUTOSHUTDOWN TWICE PRIOR TO STARTING NR 2 ENGINE. AUDIBLE VIBRATION AND COMPRESSOR STALL. MOTORED NR 1 ENGINE ALL PARAMETERS GOOD. AS SOON AS DEMAND WAS REMOVED APU AUTO SHUTDOWN WITH VIBRATION AND SURGE. REPLACED SURGE VALVE IAW MM, OPS CHECKED GOOD THROUGH 4 ENGINE STARTS.