As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK AND ENGINE START, MASTER CAUTION LIGHT WAS PRESSED AND LEFT "PACK" LIGHT ILLUMINATED. WE FOLLOWED THE QRH AND WERE UNABLE TO RESET THE PACK. ALSO UNABLE TO RESET MASTER CAUTION LIGHTS. GROUNDED - YES. BITE SHOWS FAULT ON #1 CONTROLLER TCV. RAN BITE OF BOTH CONTROLLERS AND FAULT CLEARED & BITE PASSED. RAN PACKS WITH APU. OPS NORMAL REF AMM 21-61-21.