As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 1131 CHS-FLL." RETURNED TO GATE FOR BURNING RUBBER SMELL IN AFT LAV C ( LAVATORY WASTE SYSTEM CENTER AFT LAV (LAV C) ).;FOUND MANUAL THERMOSTAT CONTROL AT MAX SETTING ADJUSTED PER AMP J38-12-34-01-01-AAA-720-A NO ODOR NOTED OPS CK GOOD THIS CLEARS MDDR# 610981 MX-4 UPDATED MCC NOTIFIED PLACARD REMOVED.