As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) RT WING STA 172.00 - DURING INSTALATION OF AUXILIARY WING TANKS, AN INSPECTION ACCESS HOLE WAS CUT IN LOWER RING SKIN AT STA. 169.00 SURVEILLANCE INSPECTON OF THE WING RIB AT STA 172.00 REVEALED AN EXTENSIVE COMPRESSION FAILURE ALONG THE ENTIRE LENGTH OF PART UPPER RETURN FLANGE & WEB SECTION.- THERE WERE NO VISIBLE SIGNS OF EXTERNAL DAMAGE TO WING UPPER OR LOWER SKIN.