As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS LAV SMOKE OCCURRED DURING CLIMBOUT IN THE LAV. CREW CHECKED LAV AREA, MESSAGE CLEARED AND RETURNED TO BLOCK. MAINTENANCE FOUND VERY HEAVY DEICING FLUID RUNNING DOWN THE APU INLET. MAINTENANCE RAN THE BLEEDS AND ENGINE BLEEDS. PERFORMED LAV SMOKE CHECKS AND OPS CHECKS GOOD. NO FURTHER MESSAGES, RELEASED BACK TO SERVICE IAW EMB 145XR AMM26-14-00.