If the machine is full of air, it's likely full of moistures, which means after 2 years it's full of rust inside the shells. We had this happen to a CVHF and it need to be retubed because the iron oxide migrated onto the tubes and reduced heat transfer dramatically.
If the bearings are now rusted and pitted... well that's all she wrote, time for a rebuild.
A centrifugal machine isnt; a window unit. It has ot be operated and maintained correctly. IF they lived without it for 2 years and were too cheap to properly mothball it, then they will pay for it.
"Pay now, or pay more later.. but either way, you have to pay the piper".