24 of them went...they only need 12 for service. Here's a video.
They put a temporary barn up in Fresh Pond so they can do inspections and the like. Wikipedia claims there's 50 42s in service, but I'm taking that with a boulder of salt, considering it also claimed that B&D sets are maintained at 38th Street yard until edits otherwise finally stuck...considering they were made by someone qualified to work that yard and familiar with what they do there lol
I do know when I went to the transit museum's Coney Island yard tour there were a bunch being SMS'd - that was this time(ish) last year - not sure if that program is over/if more are getting that spiffying up. I don't get out on the J much /shrug