As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER APPROX 5 HRS FLT TIME AT FL 310 NOTICED VERY FAINT ELECTRICAL SMELL. 5 MINS LATER L REC FAN EICAS MSG AND INOP LT IN LT RECIRC FAN SW CAME ON CB DNOT POP. CA - FOUND CB BOPPED ON CB PANEL IN MEC RMVD AND REPLD LT RECIFAN OPS CK GOOD ALL CBS RESET.