Trio / Kenwood Solid State Stereo Amplifier TK-250T

Hi guys.
Someone dropped in a Trio / Kenwood Solid State Stereo Amplifier TK-250T, for repair.
Right away I noticed a damaged balance control, and after opening the amp, it was full of dust.....
I cannot find anything about this amp online, maybe someone knows this amp and can give any info.
A service manual would also be nice...
 

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Do not have any direct links to this model, but can give you a few pointers
which may be useful:
https://audiocircuit.dk/downloads/kenwood/Kenwood-TK250U-int-sch.pdf

There were also 250 model without T or U -Google...
https://www.talkbass.com/threads/vintage-67-trio-kenwood-stereo-integrated-ampt.1326114/

https://reverb.com/item/8306816-196...-condition-built-japan-phono-1967-brown-black

It is also looks like TW-61, from the same year:
https://audio-database.com/TRIO-KENWOOD/amp/tw-61.html
so that may be another option to explore.