RTA-15TL

These are wonderful speakers that I recently acquired. I'm curious about how does one tell if a cross over needs to be replaced or repaired. it's 30 years old and I really don't know what to listen for in a malfunction. Does anyone have any thoughts? There is an "upgrade" on ebay available for replacement and or upgrade, either $95 for a rebuild or $250 for a replacement and upgrade. Any thoughts on that? Thank you so much.

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