As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA AND PASSENGERS REPORT VISUAL SMOKE IN THE CABIN WITH RUBBER BURNING SMELL DURING THE TAKE OFF ROLL, BLEED CONFIGURED AUTO/ISO-CLOSED, APU OFF/BOTH ENGINES/BOTH PACKS WHERE ON / REMOVED AND REPLACED RH ACM IAW CRJ900 AMM 21-51-08-000/400-801 A01. OPS AND LEAK TEST GOOD AT THIS TIME. NO SMELL NOTICED DURING OPS TEST.