As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN FLT 9465 MCN TO MCN TEST FLIGHT. STRONG FIBERGLASS LIKE SMELL NOTICED JUST AFTER T/O AND DESCENT ON TEST FLIGHT. NOTICED THROUGHOUT FLIGHT, BUT INCREASED DURING DESCENT. TROUBLESHOT, VERIFIED F/O'S SPEAKER TRANSFORMER OVERHEATED. F/O'S SPEAKER REMOVED AND REPLACED. OPS CHECK GOOD. NO SMELL NOTED.