Yamaha CA 810

i just took some pictures of the left channel board.you will see 2 transistors mounted to heat sinks, and 1 i removed.
Bounced good readings from right channel transistors and these 3 came into question.what can i use to reattach the heat sink to the circuit board.

2sc1918?
 
Transistors

Hi,
Sorry about that.I thought I had uploaded them.
C1628..C1624..A814. I tested all three..and out of the 3, A814 was reading
back.I just came back from store..going to install now.
 
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