As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5451 - WITH BLEED AIR SOURCE FOR PACKS ON, APU LT 10TH STAGE BLEED VALVES CLOSED RT 10TH OPEN AND LOAD CONTROL VALVE CLOSED. OPENED ISO SWITCH AND LOAD CONTROL OPENED, SAME, REPEATED SEVERAL TIMES. FOUND CONNECTORS LOOSE ON THE ISOLATION AND 10TH STAGE BLEED VALVES. SECURED CONNECTORS. NO FURTHER DEFECTS.