smoothop

i purchased a turbo from someone on here. im having a problem with boost. i fitted the td05h on yesterday. was boosting fine for a few hours thn now its making a whineing noise (sounds like a dyson) and not boosting beyond +2 psi. could this be an up pipe gasget problem ?

i have checkd all vacume hosing seem fine ? i hope the turbo isnt knackard.

ps. no smoke like my last trbo