As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 922, ORD-BOS, DIVERTED TO BUF, COCKPIT SMOKE SMELL AT FL LEVEL 380. EICAS WENT BLANK. FIRST GOT MFD 1 & 2 FAULT FOLLOWED QRH. SMOKE SMELL WAS NOT PRESENT IN CABIN. EMERGENCY LANDING AT BUF. PULLED OUT MFD 2. FOUND BURNED CIRCUIT BOARD SMELL AT REAR CONNECTORS. REMOVED AND REPLACED MFD 2 (DU4) PER AMM 31-61-01-04. OPS CHECK GOOD PER 31-61-00-710-801-A. OK FOR SERVICE.