Re: Which TDS7000 (Non-B) Serial Numbers are to be avoided?
I've repaired both types without drama.
If the NVRAM is separate to the battery, check the leakage current and if necessary replace the NVRAM too.
It's easier to de-solder than a DS1245Y-120 anyway.
Before buying a unit make sure that SPC passes.
The trigger chips in these units run very hot and can fail after 10-15 years.
They are almost impossible to find.