Take your most accurate ohm meter an measure on the ucurrent input in the mv/uA setting, it should read 10 KOhm (R2) (But if r2 has burn due to high current >0.1W in 10K what was the voltage and what else was destroyed). I have two fast lo capacitance diodes back to back over the input to prevent burning out the shunt resistors when I f... up.
Johan-Fredrik