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I have a 2430A that is just starting to occasionally fail the FPP battery test at power on. It is a later serial number that does not have the large lithium battery, but has the two Dallas NVRAM modules instead. I do have the service manual, and I have read many forum threads on this topic. The scope is otherwise in fine running condition with no other faults. I want to confirm with this group that If I replace the two DS1235ABW-120 modules with Maxim DS1230AB-120+ (or -100+) modules, I can restore the scope using the cold start procedures outlined in the service manual. I do not want to depend on reading the data from the old modules. A self-cal and then an external cal should restore the data to the new memory? Any help here will be greatly appreciated. I don't want to lose this scope!

Yes a self Cal and external Cal will restore the scope to working condition.
You will need calibrated source equipment to calibrate the 2430A if you want a calibrated scope.
For home use you may get away with a stable source and a good voltmeter.