I'm working on fixing an Opto Interface Board (520-8061-00) on a ST Pro. I'm trying to find a replacement type surface mount transistor (Q3). The package lettering reads LWW 85. I've tried cross-referencing this lettering via Internet surface mount part lists, but haven't been successful. The manual provides no part-type information. If anyone has successfully replaced one of these transistors, could you please let me know what works?