Cisco Infrastructure :: Two WS-X6148 With Even / Odd Port Failure?

I have two WS-X6148-45AF linecards here that have been out of use for quite some time. Upon inserting them in one of our 6509-E's I noticed that both had "Minor Error"s on their module diagnostics. 
 
I would have just assumed that the cards were dead and requested replacements, but both cards have the *exact* same diagnostic errors, which only seem to effect every-other port. That's too much of a coincidence for me, so I figured I'd ask on the forums and see if I'm just missing something obvious before I assume the worst. Are these cards both somehow damaged in the exact same way? Or is there some config/compatibility issue that I haven't heard of?
 
relevant diagnostic output from one of the cards (Both outputs the same, no use posting twice) is below: 
 
Router#show diagnostic result module 4
Current bootup diagnostic level: minimal
Module 4: 48-port 10/100 mb RJ45  SerialNo : SAL11391VUY

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