As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#448, LAS-JFK. (AIRCRAFT PERFORMED AN AIR TURN BACK TO LAS) ' STRONG SMELL OF PROPANE IN AFT CABIN; COMPLIED WITH INFORMATION NOTICE 2017-T015 SECT A ISOLATED FAULT TO TYPE 10 (A) C PER TSM 05-50-00-810-085-B/TSM /D. THE AIRCRAFT IS OK FOR SERVICE.'