Mag Safe LED Blinks From Green to Amber

I have a MBP bought in March 2007. I recently have been having a problem with the Mag Safe adapter. When the battery is about fully charged the LED on the Mag Safe connector starts to blink from green to amber. The blinking is rather constant, about 2 seconds a part. When I have the battery icon from the menu bar highlighted it shows "Calculating time..." and the LED is amber, and then quickly changes to "Battery is charged" and the LED turns green.
It seems that the computer doesn't know when to switch from battery to AC power when the battery is fully charged and connected to a power adapter.
I don't have an extra power adapter to try this on, as well as I don't have an extra battery. The Mag Safe connector at the MBP is perfectly fine, there is no fraying or anything like that. The wire does mostly stay wrapped around the power adapter hooks, so I am also thinking that it might be something wrong with the adapter itself, that the wires might be worn.
Thanks for any help that you can give me.

I have an issue somewhat similar to this - the battery indicator switches between claiming that it's charging and full, with the Magsafe adapter's light changing along with it. In my case it wasn't as regular as yours, but occurred while charging.
I tried calibrating the battery (instructions are here: http://docs.info.apple.com/article.html?path=Mac/10.4/en/mh2339.html ) but it doesn't seem to have had an affect. Worse, the system had shut off when the battery got low (~12% power remaining) twice now, although there was one time between those two when it went down to 5% and I shut it down myself. I have 89 cycles on the year-old battery and iStat pro claims that its health is at 39%. To add to the mix, last night I watched a 26-minute movie which ate up 20% of the battery (this is about normal), and then I watched a second one that dropped the battery by a bit under 60%. I'm guessing that the battery has some dead cells. I have extended Applecare coverage, but have heard that it doesn't apply to batteries. Regardless, people have linked to pages showing that Apple will replace batteries if they're in a poor state and under 300 cycles. I'll head to an Apple store some time in the near future and see what the consensus is.
Long story short, my battery is probably failing, and the light changing behavior started around the time that I began to suspect that. It may be indicative of a dying battery on your end, as well.

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