I'd examine the motor first. That's probably the most likely thing to fail from sitting in storage for 2 decades. It may just need some jostling or re-lubricating to get moving again.
I totally agree here. I'd be making sure it had plenty of WD-40 inside it...try and get it down the shaft if there's no holes in the motor...and manually turn the motor yourself to get the oil to penetrate.
A motor that's been stored for so long, and in damp conditions can easily seize up as it will corrode. Oil will bring it back to life though.
I wouldn't be looking into the laser either... It's a "Class 1 Laser Product" no doubt and I simply wouldn't risk it. Plus, I doubt you'd see anything as it'll be working in the Infrared range no doubt.