The good news is that most RV holding tanks are made of Acrylonitrile Butadiene Styrene (ABS) which is normally black in color. ABS plastics can be effectively melted by certain chemicals making repairs quite feasible. All you need is an ABS Plastic Holding Tank Repair Kit and based on the location of the leak you should be able to repair the tank yourself.
The bad news is if the holding tank on your RV is milky white or milky grey in color then it is in all likelihood made of Low Density Polyethylene (LDPE). As far as I know there is really no way to effectively patch these tanks and the tank will probably have to be replaced.
I hope this helps.
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