As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2025, BOS-DCA - ON TAKEOFF, HAD A STRONG SMELL OF WHAT SMELL LIKE HOT BLEED AIR. AIRCRAFT WAS CONFIGURED IN ACCORDANCE WITH PREVIOUS MEL. NO SMELL WAS NOTED IN CABIN, ONLY IN COCKPIT. MAINTENANCE ACCOMPLISHED JOB CARD FOR TROUBLESHOOTING CABIN AIR QUALITY. REPLACED THE NR 1 NASPROV VALVE PER AMM 36-112-03. RAN BOTH ENGINES AT TAKEOFF POWER. NO ODORS NOTED IN COCKPIT. AIRCRAFT OK FOR SERVICE.