As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN AFT LAVATORY WARNING WITH VISIBLE SMOKE, AN EMERGENCY WAS DECLARED. INSPECTED & FOUND AFT LAVATORY LIGHT POWER SUPPLY HEATING EXCESSIVELY. R & R LAVATORY LIGHT POWER SUPPLY & ALL OF THE VANITY LIGHT BULBS IAW CRJ700 AMM 33-25-03 & 33-25-05. PERFORMED EXTENDED OPERATIONS CHECK OF LAVATORY LIGHTING, NO DEFECTS OBSERVED.