If it has version 1.0, it has to go back to Lionel. I never saw a 1.1, all the 1.0 versions came back as 1.2, those could be field upgraded to any version.
@GVDobler posted:Thanks John. Would the same idea hold true for the 6-37921 ZW-L ?
I know Lionel changed something with the 180W brick, but in that case they also changed the sku number.
I didn't realize there was more than one version of the ZW-L. I'm pretty sure they wouldn't have changed much about it if they did a second run.
The PH180 brick apparently needed a redesign to meet UL standards. The biggest thing I see about the changes is the stupid interlock that prevents it from powering on without a dummy pin in the mating connector.