It appears that that particular port has failed the testing that is usually done on all ports during the switch start up. If you can turn it off and Waite a few minutes than turn it back on. If the problem persist, you may have to open a ticket with TAC and RMA the switch
You appear to have some experiencial knowledge of these issues. How much $$$ is an RMA likely to cost?
IF you have a valid Cisco Service Contract then you could get the hardware replaced for no extra cost. If you don't then you can talk to the dealer who sold you the kit and maybe you can work something out.
Are you saying this type of failure is likely to cascade through the entire ASIC for the group of ports this ASIC serves? Or is the failure static to just the currently affected ports?
Can't say. I've seen these error messages before and what happens next is a hit-and-miss. Sometimes I slam the flat side of the switch against the floor several times and all go good. Most of the times ASIC failure cascade to the next. The problem when it comes to the PoE controller is what happens if it starts to burn something. Particularly if you have a business and it happens at night. These are risks I'm unwilling to take.
It is a bug of the IOS. Check this bug CSCti75491 details.
C3750x and C3560x switches may fail the POST port loopback test on some ports when booting with the error %PLATFORM_ENV-3-LOOPBACK_PORT_POST_ERR: Gi1/0/X can't be brought up because it failed POST in Loopback test.
The c3750x and c3560x switches may see this issue when running IOS 12.2(53)SE2. A shut/no shut will not clear the issue.
1) Upgrade to IOS 12.2(55)SE. The problem is not observed in this image.
2) Skip POST when booting from the switch: prompt.
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