transistor replacement U2724E

[mmerig]

I need to replace a transitor marked as:

U2724E
7351

It is a small signal transistor out of an RMS module in a dbx 117.

The second number may be a date code, as the dbx was made in the 1970's.

I have the general schematic for the dbx, but the modules are shielded, sealed units and the schematic does not show what's inside them. I pulled the pcb out of the module (the potting material melted easily) to test individual components.

I searched the web (via Google) and Mouser's site, but did not find reasonable matches. Where is a good place to look?

Thanks.