2007 340 Sportsmen Clarion CD5 Audio; How the hell do you get to the Amps?

[oh no its Joe again]

Hello again:
I actually like the original sound system in my 2007 340 Sportsmen until today.
really don't want to upgrade, but recently had an issue with the outside speakers not working. Pulling that radio is a knuckle buster. Checked all the wiring, but I am thinking that something is become disconnected from the amplifiers. Maybe a jack has come loose or disconnected.
Question:
in looking at the manual the amplifiers are either under the sofa couch or behind the main electrical cabinet.
under the sofa: that would be good.
behind the electric cabinet/panel; ouch how the hell do you access it?

the wiring for this Clarion is brutal. I want to keep it. Even have a back up CD5. Just feel that something has shook loose or corroded.
Any experience with this, tips and tricks would surely be appreciated. Thank you in advance.

 

[oh no its Joe again]

ok, completely rewired the radio with a new connector. Radio comes back on by all it does is hum or feedback. There is the salon speakers and the outside speakers. From the radio there is 4 sets of RCA Jacks. Front Speakers, Rear Speakers Non-fading and AUX. What does not get connected.
with the pulling of cords in and out I think I pulled an RCA jack off one of the AMPS. I think or ????