Did you check the solder joints on the flyback? I've seen a lot of 1084's fail because the joints to the circuit board open up. With the high frequencies in the flyback, it tends to vibrate & break the solder joints, which can just open up, or even arc & spark then burn up. It's worth a shot to touch up those solder joints & see what happens.
(Insert obligatory Danger Lethal Voltage warning here!)
http://www.suburban-electronics.com/products/Flybacks%2C-Yokes-%26-HV-Dividers---Flybacks---DAEWOO
