Aac Solenoid Sticking

[Luke HCR32]

Recently followed the DIY thread on AAC cleaning here on my RB20DET R32:

http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/

When I plugged the AAC solenoid back in the revs jumped to 1800 and refused to come down no matter what I did.

I tested the solenoid by unscrewing it from the AAC valve housing and plugging it in and found that even though the engine was warm and nothing was putting load on it the solenoid arm was stuck outward (i.e. opening the diaphragm allowing air flow).

Is this a computer issue, a fuse or a case of needing a new solenoid?

I thought it would be unlikely for the solenoid to stick in the out position if it was stuffed, figured it would do nothing at all.

Would my only choice be to go brand new genuine Nissan or would a second hand RB30 unit fit?