Panasonic TH42PZ70B - 7 flash problem

[Turnip]

Hi folks,

Hate old heavy plasma but. This one works quite normally initially for 15 minutes then cuts to S/by with the 7 Red flash. Switching on again works for a shorter period so suspect something heat related. All 4 fans are working a treat.

Chap on 'Bad Caps' suggested a 2N3995 somewhere in the set but thought to check folks who might just know B4 I go hunting - Thanks - Chris.