Haha. My brain went the same direction you did - After reading the post text, I thought OP might be looking to use the device as a standalone media player, not just client. I hadn’t noticed that OP specified “Client” in the title.

Go back to reddit

The button has a part number on the housing - but I’m pretty sure the apartment manager would frown on you opening the machine up.

One idea: find the model number of the washing machine and contact the manufacturer to see if they can give you a part number for the button and/or sell you a replacement part.