Unknown component, SOT-23 package?

Good afternoon, everybody. Hope everybody is set to have an enjoyable weekend.

I'm working on a two-wire intercom system outdoor unit (first one I've ever worked on.) I'm trying to troubleshoot a problem, and even though this question is further in the circuit than my problem should be, I'm trying to make a schematic anyways.

I have what appears to be an SOT-23 package, with a triangle with a "T" in the middle of it, followed by " : 8 Y ". Not at all familiar with SOT-23's, but the little bit of research I was able to find suggested that not all SOT-23's have the same pinout, so I'm at a loss here. It's possible it's not even a transistor (I found some zener diodes in an SOT-23 package), although I'm not sure that would make sense, as all three pads appear to be landed, and I would assume it's some kind of amplifier circuit (it's going to a speaker)

Pictures: http://s994.photobucket.com/user/TBennettcc/library/Unknown SOT-23 component

I've Googled and found some articles that show you how to determine E,B,C of a transistor, but I'm getting readings in both directions with my DMM in diode mode.

I can also post what I have of the schematic so far (EAGLE CAD files, or maybe a PDF of the schematic), if anybody thinks that would be helpful. There are a few components I'm not sure about their ID, so I've made some best guesses.

Thank you so much for your help.