[RetiredandRollin]

As several have mentioned in this thread, I too experienced an ATS failure on my 2021 Montana 3791RD Legacy. I contacted PD directly, prior to seeking warranty repair, simply to educate myself. They did confirm two things; the PD52DCSD is discontinued and that they have several units on hand but only available as warranty replacements, they are not for retail sale. I then contacted Keystone and they confirmed that they were switching to a Southwire product for future installation. Couldn’t confirm the date of that switch nor the compatible model number of the new Southwire unit. I really hope it’s a plug and play switch, if not this could be a problem for those folks out of warranty. If anyone figures out the new Southwire factory installed item, please share. By the way, mine was under warranty and I installed it myself.