Reassembling the primary chest should be fairly straightforward; the hardest part may be remembering the orientation of the boards, if they have all been apart for some time!

When I first removed the player action I had noticed that the bass end was stamped with a serial number on each board component, and I wondered why. Now, having to put all the pieces back together, I realize the numbers are a guide to help you get things oriented correctly!

Once you got it all put together, let’s test the chest!
As with the other test, hook up your suction source securely.
Tape off both the row of input nipples, and the output channel holes (bottom of L board)
Activate suction and first listen that all valves are seated properly (with no leaks) in the off position.
Compare the suction level in the closed chest with what you had calibrated on a blocked feed.
There should be very minimal loss at most.

Next unblock each nipple one at a time, as well as its corresponding output hole at the L board.
Each valve should repeat quickly and reliably.
Remember that the primary valve is an “outside” valve and has opposite signal pattern from the secondary “inside” valve.
In other words, when you uncover the input nipple, you introduce atmosphere to activate the valve, which closes the suction feed and sends atmosphere to the output.
In still other words, when the nipple is uncovered, you should hear nothing at the output hole.
You will still hear a small hissing leak from the nipple, because the bleed permits the suction to pass through.

The valve design is simple, so if there are problems, it may point to unsatisfactory work such as having gotten glue on the valve facing (preventing it from seating), or a pouch which has not been sealed enough, or a blocked bleed, etc.
Examine the signs and diagnose accordingly.
In my case I had been a little too zealous with sealant application in the L board channels, so I had a couple of channels which had become blocked and had to be unclogged.

Once the primary chest is working well, attach the whole chest to the secondary chest, and test cumulatively. Now with the primary valves and bleeds in the equation, the secondary valves should repeat with as much rapidity as you can physically actuate, at least 10 times per second.

If you have problems: Go through a logical troubleshooting procedure to source the issue. Now is the time, don’t delay!