Are you sure? *What* exactly do you measure, on the diode scale, on each leg pair, both ways?I don't find any shorts on the eight output transistors tested in-circuit with a voltmeter on the diode test setting. (All test essentially the same.)
Well , they *should* test "almost" a short.The 0.47ohm power resistors on each also test OK in-circuit (not shorted).
In very low resistance power resistors, *open*is bad.
What do you read on what scale?