As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT FROM GSO RECEIVED FWD AND AFT LAV SMOKE WARNING MSG'S WITH THE SMELL OF DE-ICE FLUID AND PLASTIC. EMERGENCY DECLARED, A/C RETURNED TO GSO LANDED SAFELY. RAN BOTH ENGINES, CONFIGURED BLEED VALVES AND OPERATED BOTH LEFT AND RIGHT PACKS. OBSERVED THE CABIN AND COCKPIT FOR ODORS AND FUMES, NONE DETECTED AT THIS TIME.