When something stops working, google how to fix it.
We have repared dripping showers, leaky toilets, lawnmower, dryer and more. This always saved us the minimum service call charge and usually much less in the end to repair, as we didn't pay labour.
Google the model number and brand, plus the problem gou are encountering. Chances are, someone out there has written about handling the same situation. You can often find video tutorials as well.