i agree, replacing the IC is not for beginners, maybe you find some friend with the tools and the skills to replace him.
but, we are not sure amp IC is dead, the board must be examined, can be also another cause the IC is not working
seems one ic handle tweeters, the other one low/med but without tracing speakers to IC's, i repeat myself, we're not sure, and it's pointless. tracing speakers would point the defective IC, that's important.