Problem with my µCurrent Gold

[jackenhack]

Hi!
I've been testing my µCurrent Gold, but have a problem. It has an offset on all settings, sometimes positive and sometimes negative. My first guess was that I had blown the ass out of the opamps, so I replaced them with new ones, but the problem persists. At µA an nA ranges, it almost looks like the opamps are oscillating. I've checked all the resistors on the input, and also measured the capacitors, both in the negative feedback and the one on the power line, all measures ok.

Anyone have a clue what could be wrong?

Jacken