Did looks at a couple of youtube video on turbo testing too...
1. It’s been out of the engine for so long, evaporation I suspect will have removed any liquid oil residue
2 & 3 - yes, I did check for in-out and up-down movement and scoring on the inside of the housing - nothing obvious found. Some in-out movement but I’d associate this with the bearing and age.
Also span the impeller to see it if was smooth movement, which it was with no jerks or clucks - which I take as good news.
How reliable are the standard tubbies? Assuming you’re not abusing them by mapping to a higher boosting pressure, etc..
Can’t decide if I’ll keep it as a spare or eBay it to fund my standard suspension springs;;;