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3577A with ROM errors

Question asked by gstanley001 on Nov 13, 2014
Latest reply on Jan 11, 2015 by gstanley001
I have a sick 3577A (S/N 2333A11246) with boot-up ROM checksum errors in blocks 1 (U19) and 3 (U21).  They report checksums of C859 and F493 respectively.  What are the correct checksums for the eight blocks?

I am reluctant to believe that two EPROMs would fail at the same time and suspect some other cause.  I would like to get the board extenders to make service possible.  Does anyone have a 03577-66541 extender for sale?  I have the service manual.