As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AIR RETURNED TO CLT, BLEED TRIP OFF AT CLIMB POWER. RESET FIRST TIME, HAPPENED AGAIN BUT WOULDNT RESET. CABIN ALTITUDE INCREASED TO ABOUT 17,000 WITH HORN. MASKS DID NOT DEPLOY AND WE DESCENDED. EMERGENCY DECLARED. TROUBLE SHOT IAW FIM 36-10-00-810-801. FOUND THE L/H PRECOOLER CONTROL VALVE NOT IN THE OPEN POSITION .REMOVED AND REPLACED PCV IAW AMM 36-12-02-400-801.