Hi, I don't have an answer exactly, but on the Easy Rest sofa which a lot of Winnebago Class A motorhomes came with, there is a slide out foot rest, not drawer. On those there is a little dip in the top middle of each foot rest. You put your hand inside there and release a small flat lever. I don't remember if you pull it up, or push it down at the moment, but it's one of those two. And this releases the foot rest mechanism.
I don't know if this is helpful or not - but I thought I'd give it a try.
2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad