As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#897, BOS-LIR. 'EXPERIENCED LOUD GRINDING NOISE W/BURNING SMELL FROM AVIONICS AREA; REMOVED & REPLACED EXTRACT FAN REF A321 AMM 21-26-51. OPS TEST NORMAL PER AMM 21-26-51-710-001-A. GOOD FOR SERVICE. MCC BOB WAS NOTIFIED. ACCOMPLISHED TSM TASK 24-00-00-810-823-A. FOR ODOR EVENT ISOLATED TO EXTRACT FAN.'