Mushy
Chnage everything if you can and make sure you report the occurence to your pump people on return to UK.
Even change your pump battery if you can buy another somewhere.
Trouble is with occlusions as I discovered with the flexilink plus's it can be the sets, when you get back see if you have started a new batch of sets, they should have batch numbers on them. See if changing to a different batch number will stop the occlusion.
Not much help whilst in Russia I know, but really do report the occlusion and what happened etc to your pump people on rturn even if you get it sorted out whilst in Russia. The only way these pump manufacturers know there is problems with sets/occlusions is if we report them....
I hope that you can get this sorted, as I know how much you want to concentrate on Russia rather than your pump.... I do so hope that everything works out for the pair of you....
Best wishes ...Sha x