I've got a 9500 branded as "Modern Series 4502" with a single Lim booked in for replacement,
Found powered up but unused, the No. 6 button missing, I've no idea if its a worker.....
Yours for the postage which I'd guess is £10 ish
Probably never worked at proper co. if he's ever fitted an alarm
From the OP's POV its "worked" for yrs with 2 x ADE sounders which together used 150% of available current ( note newer tech support no. written on the instruction but still no wired right)
how take current readings - http://www.actmeters.co.uk/alarm-advice/fault-finding-a-guide/
If you up for brand new the Dispatch, Expert & Scudo are being replaced
They'll be run out deals on the old models, if your up for imagine The new Dispatch & Expert look good-
The New Scudo is a Renault Traffic which is also due to appear branded as a Nissan NV300