As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PULLING INTO GATE AND SWITCHING TO APU BLEED FOR A/C AFTER ENGINE SHUT DOWN APU BLEED CLOSED ON ITS OWN AND DUAL BLEED LT EXTINGUISHED DUCT PRESSURE ZERO APU ELECTRONICS NORMAL. GROUNDED - YES. OPERATED APU WITH BLEED AIR AND PACKS ON FOR SEVERAL MINUTES NO FAULTS NOTED. PERFORMED APU BITE CHECK NO FAULTS NOTED IN CURRENT STATUS OR FAULT HISTORY. BLEED AIR OPS NORMAL.