Sounds like you need to replace the valve seats. if you shut the water off and remove the handles you will see the valves. you have to remove them and under that you should see these little black things. they come out but have springs under them so be careful. the black things are the valve seats. i would start by replacing them
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Cartridges need to be replaced
Sounds like you need to replace the valve seats. if you shut the water off and remove the handles you will see the valves. you have to remove them and under that you should see these little black things. they come out but have springs under them so be careful. the black things are the valve seats. i would start by replacing them