As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT AT 36,000 FT, ACFT EXPERIENCED CABIN HORN LEFT BLEED TRIP OFF LIGHT. CREW PERFORMED QRH PROD RUN, TRIP RESET DID NOT CLEAR PROBLEM. PERFORMED EMERGENCY DECENT AND DIVERTED. MX PERFORMED PNEUMATIC HEALTH CHECK ON LT ENGINE. FOUND PRECOOLER VALVE OUT OF SPEC AND HIGH STAGE BLEED HOSE LEAKING. REPLACED PRECOOLER VALVE AND HIGH STAGE HOSE. LEAK CHECK OK, AIRCRAFT RETURNED TO SERVICE.