[Closed] Monarch XX lockout

I've got a 2014 Canyon lux CF equipped with Rockshox SID XX and Monarch XX with the full sprint hydraulic lockouts. The lockout needs bleeding every now and again, and I noticed last year when I rode C2C that 4 long days was about its limit (before it needed bleeding again). Does anyone know where they leak/take in air? I want to tackle the Great North Trail this year so need it to last a lot longer than 40 hours. I'll rebuild the bar mounted lockout or shock myself, but don't want to waste my time on the shock if it is just the lockout button.