As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN CABIN RT,FLOOR WEB AT FR20 -Y1584 HAS CORROSION. REMOVED CORROSION IAW SRM 51-74-00. CHECKED LIMITS L=5.0" W= 1.5" D=0.022". NO ALLOWABLE LIMITS IN SRM. R & R FLOOR WEB IAW SRM 51-42-11 AND DWG NR D53114332. R & R ANGLE FITTING IAW SRM 51-42-11 FABRICATED IAW SRM 53-11-14.