Looks like Motorola symbol.
#1 (from the front,pin side) BD 437 243
#2 BD 438 240
#3 BD 438 240
#4 BD 437 243

Cruise amp # 002 545 16 32.

Hope this helps. I have been on the "hunt" for the component most likely to be the source of our collective aggravation on these PCB's and have been successful (by luck) on one and am still testing (with no luck) on another. Keep us posted on your efforts. Good luck.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)