I'm the guy who started the thread; posting update.
As always, thanx for all the replies. I can see it's a problem I share with others. My specific problems are 1) locks don't engage/disengage smoothly & out-right fail to unlock occasionally; 2) the paddle oftentimes doesn't move the interior latch far enough for the door to open; and 3) twice now (in two weeks) the door outright wouldn't open because the latch wouldn't travel far enough to clear the holding mechanism.
Yes, I get it that I can remove & clean the mechanism and then lube with silicon. Yes, that works temporarily. But my specific question was about replacing, not repairing. So that's what I'm focused on. Not spraying more lube every couple of weeks.
Here's what I've found so far. I found a couple of latch/lock manufacturers (RVdesigner.com & trimark). Of course I would rather tell them "I have a 2016 2401S & want locks." But those manufacturers don't tag latches/locks by what RV models they work with. They can provide detailed schematics with measurements, but it's the buyers responsibility to do the measurements & figure out which model to order. I'll take that on as I have more time over the next few weeks & will post an update when I find a suitable replacement. If anyone else has run this trail already, jump in.