As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING 4K2Y BRIDGE CHECK VISIT, THE AISLE RIGHT SIDE TRACK BL 18.3 WAS FOUND TO HAVE AREAS OF CORROSSION FORWARD OF FRAME STA 375 BEYOND ALLOWABLE LIMITS PER SAAB SRM. THE AISLE LEFT SIDE TRACK BL 18.3 WILL BE REPLACED WITH A NEW SEAT TRACK SECTION P/N B533004-2 ST FRAME STA 297-375 AND REPAIR BEAM P/N B53004-3 IAW MESABA EO S53060 ON MM409 262820.