My deck fell out of my unzipped case as I picked it up and the console fell on the L1 and R1 bumpers from about 2 feet. The bumpers only worked when pressed directly down and with more force than usual.
I ordered replacement bumpers from iFixit thinking that the plastic hammer that hits the button may have been damaged, however, upon opening the Deck it was the tactile switches on the Left and Right daughter boards that were broken. The actual switch must have been pushed back into the switch housing as the bumper hammers needed to travel further to activate the switch.
Unfortunately, the daughter boards that house the switches don't appear to be available for sale yet.
I was honest with Valve about how the damage occurred and mentioned how I tried to fix the issue myself but was unsuccessful. I sent Valve videos of the issue and they told me to RMA the unit. I'm now waiting on a replacement Deck.