SDA SRS 2.3TL SL3000 problems

Hi folks- I recently bought a pair of 2.3TL's that are in wonderful cosmetic shape but unfortunately have some SL3000s that aren't producing any sound. On the right speaker, the bottom tweeter is active but the top 2 are not. I am in the process of pulling them to test resistance across the speaker leads. My ability to test the crossover is limited, both in my skill and in tool availability. I'll likely swap a tweeter from the right to left speaker to see if I get sound or if the tweeter is truly dead.

Crossing my fingers it's just a few bad tweeters (not bad after 25 years), I understand the right replacement is the RDO198. Is the suggestion to swap all 6 when replacing, or do folks run a mismatch of sl3000 and RDO198s in the cabinets?

Thank you!

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