Redhead Amp replacement. How to?

[elkkid2]

Instead of changing all the Speakers from one Redhead to the other, I thought I'd just switch the Amp part. I removed the six screws,(two on the front, and four in the back),the amp wouldn't budge.
Is there a different way?
Any Schematics for the Speaker wiring? Thanks!

 

[vickerekes]

It should just push out the front... could be stuck a bit.

 

[elkkid2]

That's alright. I just switched the Speakers. Done. Sounds great!

 

[elkkid2]

It should just push out the front... could be stuck a bit.

VERY stuck. I pushed pretty hard...as gently as possible...would not budge.