ROM 01 IIgs failing state register test

[redruM69]

I've got a ROM 01 IIgs in that fails diags with error 03011500.  From what I can decipher, it appears to be a state register failure, bit 01, address 15.  Not really sure where to go from here though.  My gut tells me CPU or maybe RAM.  
Suggestions?

 

[cruff]

This is a  soft switches test failure, looks like address $C015, bit 1?