How do you remove the shell off a GP7?  SoundTraxx says that a Tsunami 828040 decoder along with a 810113 speaker is required for this engine.  Someone in another thread said that the chassis was already milled out for a speaker.  I would like to see if that is true.

Tom

I have a new 2-8-0 consolidation and need to pull the shell so I can replace the headlight.  I burnt the headlight out when I switched out the DCC unit for a Tsunami TSU-1000.