280 TSI 2018 Exhaust valve making a buzzing noise

Finally got round to fitting the new springs in the 280 exhaust valve solenoids tonight. They have been broke for a while. Didn't go well. When in sport mode the valve is closed on flap 1 then open in normal mode. I hooked up OBDELEVEN and put it in output mode and the flap operates ok but can't seem to get it round the other way. Any idea what I'm doing wrong. Flap 2 has a separate issue, I stupidly left the plug off and i think the plug connections are now corroded. The solenoid works on the other side. Ah well, go again tomorrow.😴