getting to heart (lungs) of the matter

It turned out the combination bellows had holes in it and the fabric covering the reservoir had dried out with age and the seal is compromised.

In this picture the soundboard is still attached to the bellows assembly. It was joined with both screws and a generous application of glue. During disassembly the soundbaord broke on the short side of the wind slot. Not worried about it; it's fixable.

Disassembly and examination

The following are pictures taken during the disassembly and initial cleaning:

Here the cover under the key/reed set has been removed.

Foot pedals with straps exposed. Straps were not from the original mfr. Looks like a previous owner tried using piece of firehose to attach one of the pedals to a bellows.

Rear view. The key/reed sets are lighter colored. The wind chest/reservior back board (with hole, missing leather strap) is immediately below the key/reed sets.

Another full view