The input shaft of my gearbox (totally 190k km but revised with short gears/4.23 at 80k km, so untouched for the last 110k km) makes some noise at idle with the clutch pedal up and the 5th gear was making some kind of the sound of marbles at 1500 rpm cruising around.

First taking the gearbox out. Special thanks to Sylvian for borrowing me his lift.

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Opening the box, at first sight:
- snap-ring ok
- countershaft bearing (the one at the snap-ring) ok

Not sure what to think about the gears. There are spots and even rust ??? on them? I didn't lend my car to 007 for diving in the sea...

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5th gear: mysterious signs of wear. I've to admit that it popped out on the German Autobahn 2-3 times but that was back in 2008 or so. Something is wrong here. Of course, I use the 5th gear a lot (a lot of cruising). Opinions?

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I already have new main bearings and all synchros for sure to go in. Will do a lot of measurements by the SM tomorrow.

Expert advice warmly welcome, thanks in advance!