No, you should NOT have removed those panel screws. Most likely it is the two screws ON TOP of the cabinet that need to be removed, then the chassis can be gently slid out of the cab, it will probably only come out one way. There will be a speaker wire attached to the chassis somewhere, it's probably connected with spade connectors so pay attention and make sure to disconnect the speaker wires before yanking the whole mess out. On every amp I've ever seen the metal chassis will be open on top.
It's very important to get the black, white and green cables in their proper place when/if you replace the power cord. It could still work if it's wired wrong, but could present a shock hazard if the hot and neutral lines get swapped. Do you own a soldering iron? The cord is either soldered in, or might be connected with spade connectors or possibly a nylon modular plug.
At the risk of being obvious, the amp should be UNPLUGGED from the wall before you do any dis-assembly on it.
*edit* the back panel does not "come off"...the whole amp chassis slides out of the cabinet. It's a metal box with an open top, typically the front and back panels aren't removable.
"I have no actual information, just what the salesman told me."
Last edited by Crater : 12-13-2012 at 01:28 PM.