Our kitchen sink has a leak (drip) We changed the pipes from the drain to the disposal. Added new washers on all joints. The disposal pipe does not leak but the kitchen sink still drips! We had heard something about possibly the vent could have a bird's nest or something clogging the vent? Any suggestions?

Our kitchen sink has a leak (drip) We changed the pipes from the drain to the disposal. Added new washers on all joints. The disposal pipe does not leak but the kitchen sink still drips! We had heard something about possibly the vent could have a bird's nest or something clogging the vent? Any suggestions?
I can tell you right now it's not the vent, Can you tell me exactly which joint's leaking? Back to you. Tom