Give MacIntosh a call. I Have a feeling it's happened before. Nobody reads User Manuals.
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NO GOO GONE!!! It will definitely take off the lettering, and probably won't dissolve MELTED foam anyway.
What you need to do is heat up the melted foam and begin wiping/working it off in stages. The best way to heat up the melted foam is with steam (which won't hurt the lettering or the tube sockets (but try to cover the tube sockets with something like plastic bottle caps of the same diameter, if they didn't get any melted foam on them).
I recommend one of those home hand-held steamers (in the $40 price range) using the spread nozzle first and if that doesn't do it, then the "spot" nozzle. The advantage of steam is that you can't heat anything to over 212 deg. F. which should be more than enough to release the melted foam..
One of Goo Gone's primary purposes is paint(spills/over spray) removal. The OP mentioned wanting to retain the chassis' lettering. I'm guessing that lettering would be silk-screened(paint/ink). Also; Goo Gone is a pretty mild solvent. Plastics generally take something more aggressive, to dissolve. Personally; I'd soften the styrofoam with a hairdryer and try to peel it off first.
I'd suspect that the silk screened lettering is a baked on epoxy which is pretty hard to dissolve, then again the styrofoam is now baked on too. I'd still give the Goo Gone a try, its a natural citrus based product, quite oily in viscosity, might just be able to get in-between the chrome and the styrofoam and loosen it. I'd be very hesitant to apply more heat to the process, if the MC 275 was mine.
Best of luck and let us know how you make out.
Moonshot, I will approach this from a different angle. There is a product called "Road Rub" that is used when boot soles melt onto chrome motorcycle pipes. Part of my nylon chin strap got on my hot pipes and left a melted black spot. I was able to get it off without damage to the chrome using Road Rub. Its a dry type of product in a stick that is really effective. Anything with an abrasive content will damage the chrome. I would suggest going to your local Harley dealer and picking up a stick. It's the only thing I use when stuff gets on my hot chrome pipes.
all the best!