As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING SMELL ON TAKEOFF, SMELL IN FLT DECK, SMELL ONLY AT HIGH POWER APU OFF. MX INSPECTED. PERFORMED ENGINE RUN UP AT HIGH POWER IAW CRJ 900 AMM 71-00-00-866 CONFIG A02. PACKS OPERATED SEPARATELY AND AT THE SAME TIME, WITH HYDRAULIC POWER LOADING THE SYSTEM. NO BURNING SMELL DETECTED AT THIS TIME.