[SOLVED] Fuzzy printing from Oki C830 ?

Feb 26, 2022
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Our C830 is printing fuzzy black text. Graphics? in a test print shows solid black print. yellow is light as well.
there is plenty of life left on the drums and plenty of toner. Y drum 63% remaining, Black (K) 56%, Y toner 70%,
and Black 40%. Magenta and cyan in the test page is perfect. This started happening a few weeks ago.
What could be causing this. As this is a large format printer, replacing it would be prohibitively expensive.