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Yes, the same original 85W MagSafe 2 power adapter I always use.
I noticed that PM_SLP_S3_L does come up once every time I plug it in and drops down immediately.
I tried it with battery-only a number of times and it was turning on normally. But after going back to trying it on adapter-only, it's also working consistently now so I'm not sure it's telling me anything.
Any idea which sensor it might be? Or is it just possibly one of many? The only corrosion or damage was a little bit on the battery connector and near the keyboard backlight connector.