As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) STRONG DIRTY SOCK SMELL OBSERVED THROUGH THE CABIN AT GATE. RECIRC FAN/APU/PACKS- CONDITION ON. DISSIPATED WHEN AIRBORNE. AIRCRAFT CABIN SMELL FORM REQUESTED TO BE COMPLETED BY CREW (ADVISED BY MOC). SMELL RE-OCCURRED IN CRUISE. STRONGER IN AFT CABIN. FIM 21-00-21-810-801 & 802. WITH NO FAULTS. RECIRC FILTERS REPLACED. GRD RUN C/O SERV. (TC# 20190403001)