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RX300 audio & radio on/off problem

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Hi All,

I got (in Europe) US 2003 1st gen Rx300.

About a year ago i have managed to change stereo from us (no navi) to UK version (with navi) and all was fine (bit os soldering was needed as plugs on both radios are different.

However now my radio sometimes has no sound for few hours/days and after that plays fine for few hours/days.

When I loose audio, under sound control I am missing  MID range control and although i can see Bass/Treble + Left/Right & Front/Back controls they don't work - no level visible.

From what I understand it is an amplifier issue. I already got a new -second hand - one, but from UK market.

Now, I can not find info what is the difference between:

86100-48050 - US version and 86100-48040 UK version

Also, (before I get to my amplifier) would any of you have pictures of sockets/plugs in US amplifier? 

I could make sure my plugs will fit into UK amplifier before I unscrew everything.

Thanks!

I attached pictures of UK amplifier

20171130_155056.jpg

20171130_155114.jpg

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