As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON THE GROUND WITH APU SUPPLYING BLEED NR 1 "PACK" LIGHT ILLUMINATED. OPERATED PACK FOR APPROX 20 MIN. ON GROUND IN BOTH AUTO AND HIGH ALSO SHUT PACK OFF AND RESTARTED SEVERAL TIMES WITH NO ABNORMALITIES. PERFORMED BITE CHECK OF CONTROLLERS AND NO FAULTS. VERIFICATION FLIGHT SUCCESSFUL.