Derb

Help! I have a 30 year old Kayak pool....been great but today I noticed that one of the plywood walls (in between steel supports) on one side is coming out of the support.....I am currently emptying the water to push the edge back in and try and put perhaps a steel piece in to support the edge that is coming out.................Is that the right thing to do,or not. I have not owned this pool that long just know its age. I have changed the liner a few years ago and did replace the original walls with plywood about 12 years ago.....I just need a trick to keep the one edge in the metal strut for a few more years! I have to hire folks for all this so any cost effective help would be great! Thks Derb