As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MHT FLT 2635 - THE CREW REPORTED SMOKE IN THE CABIN, COCKPIT AFTER TAKEOFF. ALSO RECEIVED A LAV SMOKE MESSAGE ON THE EICAS. THE AIRCRAFT RETURNED TO MHT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND FOUND RESIDUAL DEICE FLUID IN THE ENGINES CAUSING THE SMOKE. THE SYSTEM WAS PURGED OF ALL FLUID. OPERATIONAL CHECKS WERE GOOD AND NO SMOKE WAS NOTED.