List from existing wiki to go here

Discounted candidates from 2012:-

PSN in NGC2768
PSN in NGC4490
PSN in NGC2649

Discounted candidates from 2011:-

PSN in NGC3126
PSN in NGC4932

Discounted candidates from 2010:-

PSN in NGC587
PSN in NGC6113

Discounted candidates from 2008:-

PSN in NGC2493