Technics sa-5170

[finnland]

Hello everyone.
I've just gotten hold of an old broken Technics sa-5170 and when attempting to fix it i noticed that somebody already had taken out the power transistors.
Now for the question, on one of the heatsinks there is scribbled 2ad586. Is this the number on the original transistor? And secondly, two of them are exchanged for BD-245c, is this a suitable substitute? I haven't been able to find the number 2ad586 on the web however i found 2sd586 which IS a good match for BD-245c. Thanks.

//H