As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEATER WILL NOT BLOW HOT AIR; DURING TROUBLESHOOTING FOUND HEATER TEMPERATURE CONTROL VALVE (P/N 3G2140V00751) TO BE DAMAGED FROM HIGHT PRESSURE CHECK VALVE (P/N 3G2140V00651) FLAPPER HALVES BEING SEPARATED FROM CHECK VALVE AND LODGED IN HEATER TEMPERATURE CONTROL VALVE AND PUNCTURING THE VALVE BODY.