Nicco

This is my first post. The Orange Exhaust inspection Warning Light on my 2015 Yeti Black Edition Diesel TDI ( mileage 27,000) has started to stay illuminated after start up. The engine starts well and runs well also it has not had the modification under the recall. My regular garage used their computer to analyse the situation and the light went off but returned after a few days as they predicted. They think the problem is that the glow plugs need replacing but their quoted price is problematic as they say that the plugs can be seized in and the labour element can be pretty open ended even possibly needing a specialist? Bit out of my depth in this issue. Any other owners had this experience. Any advice.