Tabetha - The only identifying numbers on it I quoted in my first post - PH89 52-10A and I concluded, by drawing out the circuit, that it was probably an n-channel MOSFET so I tried matching it - there were very few out there that had a similar profileand came up with one by RHOM... RK3055ETL (8A Id max - Farnell order code 1680361) but that fried before I had the chance to see if it would work with a good solenoid set!