pull out fuse block
As Jerry said you don't know the fuse/amp size without pulling them out.
My suggestion- don't do it
I had one break slightly and got it back in.
Mostly though, if you pull it out you may get nasty phone calls from sellers. Having to reset their clocks, radios, and possibly computers, etc. really pisses people off.
Refer it for further evaluation and recommended replacement by licensed electrician

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Accurate Inspections & Consulting, Inc.
773/844-4AIC
Markus Keller