So here is the update as promised.
To repair the broke pump first disassemble your loop.
Then with a straight screwdriver just remove the yellow cover. Then you will see something like this :
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After you do that gently pull the board up. Then remove the thermal sensor plug and cut the power supply cables. Also note which cable goes where - I am unsure whether the circuit works with both polarities and there is no plus minus or whatever sign so please make sure to note which cable goes where to avoid further trouble.
You will end up with something like this :
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Then just put everything back together, by repeating the above steps backwards, with the new pump and you are ready!
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That's it.
Things to note. Do not apply much/any pressure to the pressure or suction side of the pump when screwing the fittings This thing is more fragile than glass. Also the crack in my pump cannot be seen with naked eye and appeared only after two months of normal usage.
Many thanks to Shoggy - or Sven Hanisch I think it's the same and one person who generally helps.
Complain :
The same day I ordered the replacement pump I also ordered some curved fittings - paying 2 X transfer fees. Both orders arrived together in one box. So aquacomputer paid one fee while I paid two. It's not like 5 euros make such a difference in this life but what it makes a difference are the small details. Also both plastic pens I received as "gifts" for my 1K euros order are broken
Anyway that's it. Hope this thread helps someone else.