if R101 goes out of spec it creates havoc for the B+. you should be able to measure it in circuit and find 6.8k ohm. if it doesn't reach this number like immediately, chances are R101 is bad. it doesn't matter how well it tests out of circuit, it's intended to operate in a circuit. I've discussed this with Buffett at length and I'm guessing he's never seen it or something.
R89 is another suspect, I think that's a ceramic. lastly, you can entertain changing out C38.
I've got a million K7000s at work doing this, I just can't fix them right now.
I did a few K7000s at Arcadecup with the same problem and replacing those parts fixed it.
i rarely see R101 bad.
i have only replaced it in the past once or twice.
now i do see the pads and trace on it bad all the time.
once i get that all fixed up, the resister read what it is supposed to.
must be a state thing or something.
Peace
Buffett
