As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A STATUS MSG RECIRC FAN IN THE COCKPIT. AT THE SAME TIME, FLIGHT ATTENDANT REPORTED A STRONG PUNGENT SMELL IN J CLASS. FLIGHT CREW TURNED OFF BOTH RECIRC FANS, SMELL DISSIPATED. RESOLUTION FWD UPPER RECIRC FAN REPLACED IAW AMM 21-51-01-401. SYS TEST PASSED, FANS REACTIVATED.