I have a serta motion essentials 3 bed remote that kind of got washed... It's been taken apart, cleaned with alcohol, and put back together with new batteries. I have 3 buttons illuminating with no bed response. I have even attempted re-pairing bed and remote. Nothing. Remote serial in photo. Thank you!!
Post photo of board, be sure its well lit and focused, both sides.
Are buttons membrane switch ?
Gently heat remote to drive off any remaining water (the alcohol you used
probably had some percentage of water in it). Do this heat over a few hours,
in direct sunlight very effective.
The Serta website says the powersupply and remote are provided by Ergomotion. Here's the link to your remote for $139. Less than eBay but still spendy.
Replacement remote for Serta Motion Essentials Adjustable Base, version 3 (III). Please double-check that your remote looks exactly like the image to ensure seamless compatibility.