used to have 8 of these and the faults I got were usually there was a kink in the drain hose which stopped it draining properly. Easy to sort just unwind it and straighten the hose. That blue air filter behind the mesh got clogged I used to take it out wash if off - dry and put back on.
The repair technician at the franchise HQ I was with thought that Dri Eaz did not re gas these things when they went in with faults as they were never invoiced for a re gas. That's about as much as can tell you - did Dri Eaz tell you what an S9 fault was? Or may be EBAC could help but they are a long way from you as well.
Sorry can't be more use than that