Read some post somewhere about a user stating Bambu customer support told him a Y axis bearing is non replaceable and if one of them fails this means the printer is unserviceable.
Is this correct?
I haven’t heard anything related to your question, but should the bearing fail at some point in the future, I doubt you couldn’t find on the open market to buy a replacement bearing with the same dimensions and characteristics. After all, Bambu doesn’t manufacture itself these bearings, it purchases them from some manufacturer or another, and to keep costs low, most likely it’s a Chinese manufacturer who provides them to Bambu. So, having measured the respective bearing and written down the identification or part number, I would head straight to AliExpress and start looking for a replacement. I very much doubt you wouldn’t find what you’re looking for.
On an X1/P1 there are 4 non-replaceable pulleys/bearings.
Its not the sourcing of the parts that is the problem, from what I understand the linear rods are glued to the frame and cannot be disassembled.
Again, what’s glued could be unglued. What would pose real problems would be that instead of being glued, it’s soldered or even welded. In such case, one would have to replace the entire set: the rods and the bering…and that’s a spare not made available on Bambu’s shop. Could happen that it might be purchased from aftermarket manufacturers, but honestly, haven’t seen anything similar on AliExpress or similar.
Without ‘politeness forum rules’ and min word count requirement a popular two letter acronym would be the most suitable but let’s be complicated instead…:
Under consideration of a required reassembly without requiring the replacement of the ‘unglued’ components this is obviously generally more untrue than true.
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You should have had run for the US presidency. You would have been a really good fit too: at the right time, speaking much without saying anything worth remembering, or making any god damn sense… Definitely you would have had nailed all those undecided voters from the swing states…
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Pretty sure I made a lot of sense if you cared to read and you know it… 
I’m not eligible for presidency though - neither american nor in America. Clear case of baseless discrimination! But I guess those facts might not be an issue next time around if your dems win and I choose to identify as presedential and american in time… 
The bearing itself is a pretty commonly used bearing that can be sourced fairly easily. It sucks that they cannot be removed, because it could be a very simple fix if one were to go bad.