Exhaust place put an inspection camera through the exhaust and removed the dump, checked the wastegate, turbine housing, turbo bearings and exhaust manifold. Also checked what they could in terms of intercooler pipe leaks. Didn't find any issues. I think I might try to make something up to pressure test, or get tested, my intake system. Just a question on the wastegate test - if I'm disconnecting the line from the compressor housing so there is no boost reference to the wastegate, wouldn't that create a massive boost leak anyway? Given I bought a new solenoid, I might just fit it anyway.