As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT # 2016, BUF-BOST(AIR TURNBACK TO BUF). WING A/I 2 LEAK WARN EICAS IN FLT RAN QRH WING A/I OFF. AVOIDED ICING LIGHT EXTINGUISHED W/ A/I OFF ; FOLLOWING FIM TASK 30-11-00-810-807-A, REPLACED R/H WING OUTBOARD SLAT 4 TEMP SENSOR HARNESS PER AMM 30-11-02. PERFORMED SLAT CONTROL SYSTEM OPS TEST PER AMM 27-80-00-710-801-A AND WING ANTI ICE TEMP SENSOR OP TEST PER AMM 30-11-02-710-801-A CHECKS GOOD NO ANTI-ICE FAULTS.