If you can't sleep at night, then replace it ASAP.
If you can sleep but still worry, then replace it when you do the clutch.
If you're not worried at all, then don't worry (and don't do anything).
I have had three major engine failures and none were caused by the IMS bearing (140,000 miles, 205,000 miles, and 300 miles (don't ask about that one)). Plus just sold my 996 still running strong with 146,000 miles on the original bearing.
Also, both IMS bearings on the 140K and 205K mile failed engines were in perfectly good condition (both early double row).
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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