Compaq AlphaServer GS60E Service Manual page 37

In general, if a module on the TLSB does not pass self-test (green light is not lit)
it should be replaced.
There is a case where some removal and replacement action may be
needed even though the module passes self-test.
Failure of the built-in self-test for the MS7CC modules indicates that testing
has shown that there is no single 64-Kbyte segment of memory that is usable.
Each 64-Kbyte segment must show at least 256 bad pages before it is noted as
unusable. However, it is possible for a SIMM to warrant replacement, even
though the module as a whole passes its self-test.
You can determine faulty SIMMs with the show config console command, as
described in Chapter 3.
Troubleshooting with LEDs 2-7