It could be the old bulbs. Swapping them out for new ones won't bring anything back from the dead. But I'd do it anyways.
What is your flow like? I've found that many species of coral both soft and stony can appear to do fine for months with inadequate flow and then suddenly die.
Double check your salinity and temperature just to be sure. My old Neptune controller was once out by 2 or 3º which caused me some problems until I re-calibrated it.
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