Just did another one for a new customer. This was found at annual, the inspection panel kit was installed 2 annuals prior and was never noticed. We did both sides even though the other had no signs of corrosion. The other side did show light rust color on the steel bracket. Hard to believe this rotted out in a year since last inspection. 1965 28-140. Keep a sharp eye! If you need it done we are in Central FL.