Friends-196M just came out of annual. An item I bring to your attention and unfortunately I do not have pictures. The wing walk area is strengthened by 3 vertical steel supports that are welded to the tubing and riveted top and bottom to the wing surfaces. They are inboard of the flaps and can be seen when the flaps are fully deployed. All 3 of the braces were cracked/busted and the A&P had to fabricate new, have welded in and then re-rivet the wing surfaces.
Flap had to be removed, etc. Total repair time was over 15 hours.
TT in service is 1900 hours +/-. if you notice any oil canning, etc when you step on the wing you might have your mechanic check it out.