How to fix cracked central air drain pipe at the P trap?

I had a new Lennox Central Air unit installed in 2013. The air handler is in the attic as I had a boiler for heat (not a furnace). The air handler's PVC drain pipe (white 3/4" pipe) is cracked and leaked water through to the ceiling below. I cut out section where it was cracked and replaced it with a new section of PVC. However, now the p trap (or is it a S trap?) is cracked and leaking. It is leaking right where the bend is. How do I fix this section? The straight section was my first pvc repair and it looks to have gone smoothly. Just not sure how to cut, or replace this new leak. Thanks! http://imgur.com/a/od1O0

submitted by /u/GeekFreak96
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