Leica M6 - crazy lightmeter - ISO dial potentiometer

Hello,
is anywhere available how to disassemble backdoors of Leica M6 Classic - to fix/check potentiometer of ISO senstitivity dial wheel please?

Lightmeter on my M6 is crazy - most usually (ISO 400-6400) only left arrow < lights on when I set aperture to maximum value F16 arrow < light off (dissappears, no arrows). I have to set ISO about 50 - 6 to get also right arrow > light on. But then one arrow will start fading and second arrow starts to increase - it takes few (about 5-10) seconds to stabilize (at the same time I am changing exposure time / aperture) - both arrows stay light on.

I assume the issue with potentiometer of ISO senstitivity backdoors dial wheel- some dirt or short circuit.

(contacts of battery compartment clean, battery itself clean and new battery (more new batteries tested), golden backdoors contacts clean, lens cap off, lightmeter sensor clean, reflective white dot OK)

Note: it measures sometimes underexposure but also sometime overexposure

Thanks for your reply.

I'm sure Leica could take care of it. According to Leica's website they might take awhile, but I've also sent my M2 to KEH for repair - they have reasonable rates and turnaround times.

If you're skilled and you can get it apart there might be a way to clean the pot with electrical cleaner such as Deoxit or a similar product. (If it's really the pot that's the problem.)

And if all that's too much, the camera is still very useable without the internal meter.

I had a run in with erratic exposures with my new MP the first week I had it and had to send it back. Apparently, as explained, the shutter speed dial mechanism partially failed and was sending erroneous signals to the little light meter indicator, or something like that. Replace the batteries and clean the contacts (if that hasn't been done), then think about sending it to someone who does non-100% mechanical M disassembly and reassembly at least once a month.

I would send it to KEH or DAG. They got a bunch of spare parts if needed.

I'll echo the DAG recommendation. He's saved me a couple of times on related/similar Leica issues.

https://www.dagcamera.com/contact.html

Thank you very much for replies all of you. I found the problem is most probably with the flex cable (3 golden contacts in the body) - when flap is closed it behaves as the flap open (no contact between 3 pin golden contacts in the flap and 3 golden contact n the body). It works only when flap has slight contact with the body - So I have to little increase the space between flap and body contact OR fix the flex cable. I already did it - space between flap contacts and body contacts was increased but now I have the new issue (with the same camera):
Light metering delay - Leica M6 Classic (prod. year 1986)
Description of the issue:
Correct exposure preset. Then when I halfpress shutter button (only 1 diode lit at the start - arrow pointing left on this video below) it takes about 20 seconds to get both lights >< lit.
In other words: I have to hold halfpress shutter button for cca 20 seconds to get proper exposure values by camera light metering.
Does anybody met it, fixed it?

(Fresh battery used, all contacts clean - measured 3,1V)
Check here please: