MJC62: Thanks, sounds like the way to go. Enclosed is a picture of the lines from floor to/from the basement locker: looks like Thor foamed into the entry and exit holes, but left the lines themselves completely exposed. I have no idea how far into the locker switch cabinet the foam extends, but my guess is if they didn't foam the lines themselves, there's probably no insulation inside the selector switch cabinet. Has anyone tried removing the front of that cabinet to get inside?
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