How do I repair a "rubber roof?"?

We had a rubber roof installed on our patio. The guy who did it was unexperienced and needless to say, it has leaked since. I would like to find a way to repair this, if possible.

Can it be repaired? If so, how and with what?
If not, I'm considering replacing the rubber. (The angle of the roof calls for either metal or rubber. I don't want metal because of the noise when it rains so we're doing the rubber roof.)

In replacing the rubber, can I just lay another layer on top of the older rubber or do I have to take it up and replace the entire thing?

View this post on my blog: http://madeinhome.info/how-do-i-repair-a-rubber-roof-2