As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1023, BOS-STI. (AIRCRAFT PERFORMED AN AIR TURN BACK TO BOS) ' VENT SKIN VALVE FAULT ON TAKE OFF BURNING SMELL IN COCKPIT AND FAN NOISE; REMOVED AND REPLACED AVNX VENT BLOWER FAN (20HQ) IAW AMM 21-26-51. AVEC TEST WAS OK. NO FAULTS RECALLED. OK FOR SERVICE.'