Find memory leaks in node.js application

I currently have an application in closed beta deployed on Heroku. The technology stack we are using is MEAN (MongoDb, [login to view URL], Angular.js and Node.js). We use New Relic for monitoring. I am looking for someone with some experience in finding and correcting memory leaks in node.js applications (for example, using memwatch, v8 profiler, etc) as I've noticed a gradual increase in memory usage as reported by Heroku and New Relic. I would look into it myself but am flat out on a couple of other things at the moment. I will reply to you with some further details once I'm confident you have the relevant background.