As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURN TO GATE AFTER ENGINE START AND INITIAL TAXI DUE TO REPORTS FROM PASSENGERS & FA'S OF A LIGHTER FLUID ODOR IN THE AFT SECTION OF THE CABIN. REMOVED AND REPLACED PRIMARY AND SECONDARY HEAT EXCHANGER AMM 21-51. LEAK AND OPS CKS OF LT PACK ARE GOOD REF MD LOG 1494940. (8396500) (AIRCRAFT GROUNDED)