MY SINK IS DRIPPING LEAKING UNDERNEITH THE KITCHEN SINK

Make a contact with your local repair man or sink supplier as they can suggest you a good expert who can fix that. IF you are from the USA then may make a contact with a store as "BuilderOutletUSA" where not only you may get a good suggestion on your issue.

First do some problem isolation to make sure the water is not coming from the supply lines dripping along the pipes, or from a leak at the sink/counter interface and just dripping down on the disposal and drain from up above because caulk is bad. Also check your sprayer hose to eliminate that. Best way is to dry it all completely with paper towels and a hair dryer and then watch what happens when you run hot and cold water. If it is a double sink, make sure it is not drain water coming from the other sink and migrating over to the disposal side. The reason for all this checking is that the drain connections are notorious for leaking when they are bumped like if you store pots and pans under the sink. Once you have pinpointed it to the disposal as you first believed, then you need to dismantle it and check the gaskets. G

What kind of faucet? (single handle, double hndle, kitchen, bathroom) Where is it dripping from? (handle, aerator or faucet head, under the sink) There are many types of faucets and many types of leaks. Sorry to be so vague but there's a pretty wide spectrum of possibilities, a little more info will go long way.

If disposal is leaking, it has to be removed before it damages cabinet and causes mildew.
Then install a different strainer basket if you want to connect tubular drain.

Tubular sink basket
http://media.rd.com/rd/images/rdc/family-handyman/2001/11/Kitchen-Sink-Basket-Strainer-af.jpg
Disposal sink basket:
http://0.tqn.com/d/homerepair/1/0/m/0/-/-/sink_flange_noted.jpg

You can also buy same brand and size disposal and install without changing sink basket.
I wrote ez disposal replacement steps that show disposal removal and tips for connecting tubular drain.
http://www.fixya.com/support/r7929008-replace_garbage_disposal
.

If you have properly replaced the diverter assembly, there is either a problem with valve or debris was left in the valve from old diverter when new diverter was installed. Disassemble diverter by pulling spout back off. remove new diverter and check valve. Cup your hand over faucet and turn cold water handle on to attempt to flush any debris left behind. Try several times then reassemble. If this doesn't do the trick then replace. Get a quality filtering system and take care of your new faucet by making sure it's dry and polished after use. You won't be replacing your fixtures as often from calcium and corrosion.

Check for a leaking O-ring/Washer/Seal and replace. Sometimes the internal parts of the sprayer head will wear out. Replacement sprayer heads can be obtained from your local hardware store.
I'll look forward to hearing back from you. :-)

Yes all can be replaced. They sell complete replacments at Orchards, Home Depot or Lowes. Just make sure you are getting the right parts.

ouch sadly im sure it was pricy to have him out  so my suggestion would be to call him back and have him take off the price of what he charged you or have him fix it for no charge could be just need some plumbers putty around the faucet to stop a little water that may seep threw under the faucet good luck 

it will only leak under load you should be ok to replace it.

Got it! Your return line is clogged!

I have the same dispenser, and there are 3 tubes attached to it. One of them (black on mine) goes from the faucet to the drain pipe coming down from the sink. That line can get clogged over time with stuff coming out of your sink. You can probably disconnect that line at the drain pipe end and **** oput the connection and as much of the hose as you can get too., Reattach the line and you are done. Fire it up.

On my unit, we hear a dripping sound in the drain when the unit is charging. If you don't hear the dripping sound after using the unit, that line is probably clogged up!

See ya!

Everett