developer turning paper yellowish

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Dan
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Hi everyone hoppe you can she dsome light on this. we have an agfa dlab 2 which was fine for the first 18months or so then all of a sudden our whites seem to be off like a cream/yellow ive dumped the chemistry 1 by one and narrowed it down to the dev but when we put new dev in the whites are perfect but within a week or 2 they start going off again any ideas what this could be? people have said it could be low utilization but im not so sure. Thank you
 
how often do you change the chemistry?
 
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