As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WITH APU SUPPLING AIR TO THE LEFT PACK AND RIGHT PACK INOPERATIVE. THE BLEED SYSTEM DID NOT SWITCH OVER TO ENGINE BLEEDS. LEFT PACK NEVER CAME ON. NO STATUS , ADVISORY OR CAUTION MESSAGES CAME ON. TRIED TO CONFIGURE SYSTEM MANUAL BUT COULD NOT GET THE ENGINE BLEEDS TO THE LEFT PACK AND PRESSURIZE. FOUND MDC MESSAGE ACSCI FAIL, REMOVED AND REPLACED ACSC1 IAW AMM 21-61-04 OPS CHECK GOOD. PERFORMED OPS CHECK OF NR 1 PACK SYSTEM IAW AMM 21-51-00, OPS CHECKED GOOD.