As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM: AIR CONDITIONING LEFT BAY HAS AN AC LEAK. PERFORMED OPERATIONAL CHECK. FOUND AIR LEAK AT SECONDARY HEAT EXCHANGER. SUSPECT AT FAULT BY CRACK. REMOVED AND REPLACED SECONDARY HEAT EXCHANGER LEFT PACK AS PER AMM 21-51-03, OPS CHECK OK.