I have a combination bath tub and shower. The fixtures are manufactured by American Standard. There are 3 handles that control the water, hot, cold and the center being the tub/shower diverter. The diverter is leaking and I’m not sure how to fix the leak or what I will find when I remove the diverter handle. I don’t want to get into something that will ruin the unit and cause me to replace it. Any help is appreciated. Thanks