Unknown transistor repairing a TI990/5 power supply

I'm working at the power supply of a 990/5 minicomputer. The chassis is a 6 slot version, with 20A power supply. After a few minutes of working, the fuse blow and I found a transistor on the main power supply board with collector in short circuit with emitter. The transistor has TRW logo and is market with Texas part number 996070-003, in addiction with the date code. Pictures of the transistor here : http://www.museodelcomputer.org/parts/texas/990_5/IMG_6442_transistor.JPG http://www.museodelcomputer.org/parts/texas/990_5/IMG_6445_sotto.JPG Google give me only a link, were it seem to be an Optek SVT6747 ... another unknown transistor :( Someone has experience with this power supply ? http://www.museodelcomputer.org/parts/texas/990_5/IMG_6423.JPG Texas part number is 944970-0001 Thanks for any help ! Alberto ------------------------------------------------------ Alberto Rubinelli A2 SISTEMI ELETTRONICA, INFORMATICA, NETWORKING Via per Occhieppo, 29 Tel 015 8853203 13891 CAMBURZANO (BI) - ITALY Fax 015 8853202 Mobile +39 335 6026632 Mail : alberto at a2sistemi.it Web : www.a2sistemi.it FONDAZIONE MUSEO DEL COMPUTER ONLUS http://www.museodelcomputer.org Mail:info.museodelcomputer.org Tel 015 8853201 Fax 015 8853202 ------------------------------------------------------ Le telefonate con numero nascosto sono filtrate Calls with no caller identifier are filtered ------------------------------------------------------