Philips 28PW632A?

I've had this TV for 10 years without any trouble apart from the last 3 month when it started to develop an intermittent fault. The screen started to flash green and go off for moment then come back on. It some times loses sound but most times it's just loss of picture. I've had it to a local repair shop who said it was the tube and started to offer me interest free deal on another TV (Suspect or what)