Had injectors tested by leak of test and all ok glow plugs work only fault code was 1110 live trat engine temp was 16.5 and fuel pressure was nearly 3000it was in psiHave you checked that you are getting power to the glow plugs?
If the engine is above 15°C, the glow plugs won't be used for starting, and the ECU won't power the glow light.
The glow plug control module is easy to change, but I've never known one to fail.
Fault sounds more like a leaking injector, than a glow plug issue.