As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GSP - DURING CLIMB THE CREW HAD A LAV SMOKE INDICATION ON EICAS WITH VISIBLE SMOKE AND SMOKE SMELL. CREW AIR RETURNED TO GSP, MX PERFORMED HIGH POWER ENG RUNS FOR APPROXIMATELY 3 MINUTES AND COULD NOT DUPLICATE DISCREPANCY. A/C WAS RETURNED TO SERVICE.