before buying i didnt see any problem.
but the other night while trying my new ir pistol laser. i noticed black faint marking while looking at light sources.
Also at end was some build up of condensation of the inside of the lens closest to the eye. I did watch the clips before hand. i believe i lack in the skills and equipment. frankly im afraid of F***** it up. My track record opening things up it not great lol ?
Fair play - I don't blame you!
"Faint black marking" - this could either be a "blemish" which is damage to one of the key parts of the unit - sometimes, they just happen as the "tube" (important part of the unit) is manufactured but they can also get caused by looking at bright light sources for too long, lasers etc - So be very careful with looking at bright lights!
Sounds like a service is a good idea, getting your unit purged should stop that condensation. You can also get "demist" lenses for the rear if you don't have those already, which help against condensation - they're pretty cheap.
Have you thought about protecting the front and rear lenses yet? BBs can shatter glass so it's best to get some form of protection up similar to how you would for an RDS
Best way to get an idea of blems would be to take a pic through the pvs14 (example below), against a blank wall so you can spot any blemishes. It could just be dirt though, so a clean could sort it.
^^ That dot is the blem
https://www.facebook.com/groups/175676493297552
^^ This is a sales group for NV in Europe, and I reckon you'd be able to find someone there who's able to service your PVS14 if you wanted - If you're on Discord, this server might have someone:
https://discord.gg/b3MECua9
Good luck!