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1998 crown victoria My personal suggestion would be to go for these repair catalogs. I know this website reliable-store that i used to buy them from, and they sold online it was very good manual. Go ahead, I bet.
Unfortunately with car audio, especially the Chinese made amps, only the company would have them. Few companies make them available because they handle service in house unlike other consumer electronics.
The surface mount ic= MC33079D , 14 pin quad low noise op amp is likely at fault, IF the amp is NOT showing a fault light. A LM324D surface mount will also work in a pinch. It's located on the input pcb attached to the input jacks.
I do not believe that these are available outside of authorized service centers. Can you please describe the problem you are trying to resolve? Also, Crown amps are not the simplest in design. Use caution when working on these, there are high voltages present throughout the chassis. You can contact Peavey Corp directly to purchase a service manual if they are available.
On a crown amp you will need a service manual man. That's like working on a Rolls Royce and trying to work on it with Toyota tools. Get the manual or do not wist your time, you will be spending loads of time on this if you don't. If you know where the diff. transistors are, check them out of circuit on high resistance.