Shorted output transistors in a Sony model STR-DE135 am/fm stereo receiver. MP1620 and MN2488, what are they ? what do they cross to?

Have two shorted output transistors on the large heat sink in this unit (Q754) MP1620 on the transistor and (Q753) MN2488 on the transistor. Above both #'s (MP1620 & MN2488) on the transistors are the letters SK. Can't find a replacement for these.What other transistor's might/do they cross to? Thanks, Jay

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