Darreen,
I would disagree with you, just because your having a problem your advising everbody to stay well clear of the raptor..........
when infact the raptor is one of the best porty,s around , well built and proberbly the best heat around for a porty.
I,v had used a raptor for a few years , admitadly as a back up machine now , but always found it reliable, usual problem to be expected as with any machine ie. vac motor and did have to replace bearings in pump once , simple quick job though .
out of interest, does your pressure actualy drop ? or just the readings ?
Have you a kink/bend in your line inside machine? often when closing back up you could trap or kink some thing. just a thought .
Geoff