Hi, not sure if this helps, but for budgetary calculation, you should be able to get a. replacement transfer box for about £400, uprated spline sleeve if needed £140. New siren module £150, labour from Indi about £300 ( mine was for fitting transfer box, sleeve and oil).
If there is gearbox problems, prob at least another £2000, but discount labour on transfer box and sleeve.
As they get older, xc90 do not get cheaper to repair, but you have to factor in a cost to replace and if you like the car...
The alarm will have a failed battery that you can replace yourself but you need to remove unit, cut it open and replace the battery. This may or may not fix the problem, but I chose to replace mine with new. This is an easy replacement and the new kit has all the parts and instructions..
Good luck and I hope this helps. John l
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