welcome!
 to the HUBB!
If you are happy with your bike, keep it......... if the bike runs OK and you feel OK about another 12,000km then go for it!
I would have the Cam chain checked just for peace of mind...... better to be safe than sorry.
50,000km is only just over 31,000 miles.... no where near replacement time yet!
you obviously know your bike and enjoy it..... keep doing so, XT's are reliable, pretty bulletproof and like a good wine, they get better with age.
Martyn
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