Looking for 550WI schematic

Hi Everyone, Been a Polk Audio user since the 80s and my speakers are still going strong! Need a schematic to fix our drummer's sub which looks very much like the black smoke has escaped from some components..........he assures me the underside of the PCB is very much intact which is a good sign. I get the impression this one is more than 10 years old "serial = AM5536000235/ DOM = 3073133" which from reading above means I might need to replace some e-caps due to out of spec ESR.....this is going to cost him some beer! Cheers, B.

@SeleniumFalcon would you be able to send me a copy too? I found one on marketplace that is not working and would like to see what the circuit looks like. Thanks so much!