DT300 Power transistor?

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I hope someone can help me. I know this isn't a DIY amp but i have a problem. My DT300 plate amp bit the bullet a week ago. I traced the problem down to 1 of the 3 power transistors. The problem i'm having is there is no code stamped on them. The only thing i can see is 1 number on each transistor 8L 87 29 .....
Is there a way i can identify them/find replacements? . I e-mailed RCM Akustics but no reply.
 
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