Chris,

You can use Highlight Station to track down the errant pipe.  Simply draw a new segment of pipe somewhere, and use Highlight Station on it.  It will highlight all similar unsized pipe, which will include that little piece.  However, it could very well still be difficult to spot since it is so small.  So you might need to type FXDEBUG to turn on debugging mode, and then highlight, and the entity IDs will be echoed to the command line, and you can delete them following the steps here.

--J

Chris,

You can also throw a Work Area over a portion of the plan and run a schedule for just that Work Area to see if it shows up. Move the Work Area around and make smaller as you get closer to the area the pipe resides in (regenning the schedule after each move of course). This in combination with what Jeremiah suggest should get you squared away.

Thanks, the work areas method worked, the debug mode didn't seem to find the pipe. 

Thanks again.