The pedalboard is removable. The pedalboard key sit on backfalls maintained in high position by springs to avoid that the mechanics falls when removing the pedalboard.
These backfalls activate the pedal couplers with wood pins and the pedal windchest pallets with anothers backfalls..

The pivot point for the backfalls

backfalls

Other view

Pins guide

The front of the backfalls

The springs comb

the pedal coupler roller board

Wooden pins for the pedal coupler

Other view

Under the windchest, we can see the second backfalls connected to a wire that pulls down the front of the pallet.

The pedals for the couplers

Back