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Are you 100% certain the yellowing is on the inside. Typically, bulbs that are too high intensity tend to leave local 'burned' areas on the inside of the lens.
My 01S lens had yellowed. It was the interaction of the sun and the outer sealant. I went to a recommended shop, who ground the outer layer off and resealed the lenses. They look brand new.
Pictures would help folks advise you
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