you forgot the 74F253s. Those are the muxes for the row/column address strobes for the RAM, if those are bad, youll get this screen as well as sad macs, depending on which ones bad. 

Also, Keep in mind you may need to start looking at the PALs. These machines are old enough that if they were stored in a moisture laden environment for 30 years, they will seep through the epoxy and start attacking the silicon die, and you get this....