if you remove the control panel ( with power off, there should be some paperwork in an envelope ) it will tell you a little about the components inside .. need to check resistance of primary winding of High Voltage Transformer .. should also check High Voltage Capacitor as well … ( and can also check the Mag Tube as well .. ) this is not necessarily easy and should remember that HV Cap’s can store a lot of electricity so try to wear rubber gloves ( how old is unit ? ) sometimes it may be worth while calling a Frigi auth service tech ..