Hello all,
We wanted to provide a update on this project. Banging noise solved! Thanks to those who tackled this before us
We followed their advise and completed this without issue.
We wanted to share some pictures and explain the process.
1.You can remove the main strip without any tools. You can gently wiggle the piece from side to side and it will come out. It is basically held in with about 8-1in thin nails along the strip.
2. Using a small tool, i.e.; small pry bar or butter knife, (see pics) pry your way underneath the 1/8 siding. Be careful as it is pretty thin. It is held in by very small staples. Once you remove the first staple, you can slide the pry bar along and remove any other staples fairly easily. We added the blue tape to protect the padded area. We removed approximately 5 staples on both sides of access area. Even after the staples are removed, you cannot see down there and access is tight.
3. Using the "Great Stuff Window and Door" expandable foam (the blue type) we extended the hose by purchasing additional 1/4 inch clear hose to add the required length to reach the area. We taped that down to some cut-out cardboard to keep everything nice and neat. We shoved that down to the area and filled it with foam (used about 1/2 can total). We made sure to move it around to get both sides and around the area.
4. We let it sit overnight and tested in the morning.
Problem solved! All-in-all, it took about 2 hrs to complete and approximately $15 worth of parts.
Hope this helps others having the same issue!