I arrived to perform a diagnostic on an air conditioner. Upon arrival customer informed me that water coming out from underneath their furnace. I checked the coil. Coil was not frozen. I noticed that water was standing inside box under furnace. I then cut pvc drain pipe and found that there is a clog in the trap, cut and replaced part of condensate pipe. I poured water into pipe to make sure that it drained before gluing pipe together. I also added a T to the pipe to help with any clean out later in the future. After running for 45 mins, did not find any further clogging or leaking. Draining properly now.