DSW PRO 500 with green to red power LED

Old DSW PRO 500 produced a popping noise from the woofer, and then the sound of snap crackle pop, on an internal board. I did find R23 & R24 on the power supply with some black stuff around them. Zener seems to be OK. I know I can get a new amp. but when I checked the resistance of the woofer I read 4.3 with a good meter. The unit has not been pushed hard. Most 8 ohm speakers read about 6.5 ohms, could the woofer be damaged?

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