Suspension Advise needed please

Hello



I had my 1996 MGF suspension pumped up in Feb. It has been ok up until a few weeks ago. It has started to sag on the drivers side. There is about an inch and a bit difference between either side of the car. It has not affected handling or ride or anything but it just looks uneven. It will only get worse I suppose.



I spoke to my Dad about it and he said it could be leaking and/or have a dodgey can or sphere?



I have mentioned this to my mechanic and he says that it is probably the suspension pump and he will source a new one for my car.



I am not entirely sure what to do now as I do not want the wrong thing changed. What is the issue? I also thought it could be leaky or am I getting confused?



Thanks

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