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I did not see any explanation why, but directions on how to do it (with the Hose TSB). With the timing belt it reffered as the next regular service interval fix.
On my '93 850, I assume they were done, during regular service intervals (especially the timing belt related TSB) or dealer recalls, since they were during warrenty period.
I would try the Alldata.com subscription. I got my money worth just replacing the rear break pads and discs, let alone cleaning A/C cabin sensors ($200 each, dealer price), transmission fluid change instructions and etc.
Ronjon
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