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Jamesp:
To your last two comments...
1 - the differential effect of loading on dual and single row the rates of spallation
2 - two mechanisms at play: a) heat hardened bearing seals leak and allow engine oil to blend with / wash out bearing grease and b) contaminants build up in IMS tube oil because inflow and outflow rates are different and they find their way eventually into the IMSB through the leaking inner bearing seal
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