House and plumbing are 25 years old. Drain lines are all white PVC pipe and accessible in the basement. On one of my 2" drain lines coming out of the kitchen, at one of the connections, I'm getting a very slight drip (about 10 drops a day) and also on my 4" drain line, I'm getting a similar 1 drop an hour drip at one of the connections. No where else in the house are there any leaks that I can see. My question: Is there a fix short of ripping out the fitting and regluing in new connections? Could I clean up the joint as is, and use either a silicone sealer or wet environment glue to re-glue these two connections? Anyone have similar experiences with successful fixes?