As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT PACK SECONDARY HEAT EXCHANGER BOTTOM FWD END HAS PIECE BROKEN OFF. STARTED HEAT EXCHANGER CHANGE. STOPPED AT STEP (F). REMOVED PRIMARY, SECONDARY HEAT EXCHANGERS AND PLENUM FOR ACM AS AN ASSEMBLY. NEED TO COMPLETE INSTALLATION. ACCOMPLISHED UP TO AND INCLUDING PAR 3F(2)D. COMPLETED INSTALLATION. OPS CHECK NORMAL.