Speaking of migrating and nesting birds, are there any bird nests or mud dauber colonies that have set up housekeeping in the plane. Check for mice homes too. These will need to be removed for safe flying and operation of the airplane. If your plane is in a hangar, don t discount the possibility of bird, wasp or mouse nests. Hangars allow the entry of our other nature friends, flying or creeping.
Corrosion weakens the aircraft structurally and needs the attention of a mechanic.
Then there are tires. Tires that sit for a long duration will take a set and have a permanent flat spot. While checking the tires, look at the brakes. Think about the Weight and Balance and when it was done last. They save faces and lives.