BMW 520d jumping out of first gear

I own a 2011 BMW 520d with a manual gearbox that pops out of first. Can this gearbox be repaired or does it have to be replaced? I understand that this is a sealed unit.
If you can't get any help from BMW itself, can repair BMW manual transmissions. Last one with synchro problem cost the reader a very reasonable £850 + VAT.
Answered by Honest John on

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