need help, audio dimensions modified pas, need any schematic, manual, information..

recently bought on ebay, audio dimensions modified pas. everything works. after cleaning, especially going over circuit board traces with q tips and lighter fluid, sound dramatically improved. as to caps, theyre all mostly sprague. big orange drops 600v. where do i start with this preamp, it sounds cold and boxy. on my st-70 im using solens. i like them. the p.s electrolytics are huge plus the multisection cap is still used under the selenium rectifier bracket are 2 sprague,similar to originals. so thats 4 caps plus the quad filter cap...............the board caps are a mix of different brands. they are all hard to read. need a schematic or part list or manual if someone has any. again, help prioitizing what to do first......just want a warmer sound, thanks for any info. ED.