sun mga 1200 gas analyser unlock

[davesaab]

hi there i don't know if anyone can help me ,today i purchased a 4 gas analyser sun mga 1200 and it was not working,i replaced a few pipes stripped the pumps down cleaned and now I'm not getting LOF lack of flow great fixed,the problem i have now its asking for service this is a Mot thing these can be switch off does anyone know how to do this or they have a unlock code cheers Dave