bad object

Just today operations started warning:

	error: Could not read 4e69489a0ac11a9b62a25923975bfc370a30eae5

This is Documentation/networking/baycom.txt from
518e6540831c69422faecceee8f964bd439ac9d0 (pre-2.6.13), which is easy
enough to find from another repository and fix the problem.

But I'm curious--how do I find out what pack file that object should be
in, and what the corruption looks like?

This is the third time I've found corruption in a repository on this
laptop, so I'm a little suspicious of the hardware.  (The second time I
reported here: http://marc.info/?l=git&m=121968278319668&w=2.)

--b.