Can you help me identify this resistor please? Is it 1.91 ohms resistor? In such case where would I find such resistor to replace this burned one?
It's very hard to tell, as the heat from the failure has changed the colours. It's likely 39 something, as that's the only E12 value which would match (68 is possible but less likely).
Your best bet is to sketch the surrounding circuits and post a picture and we may be able to infer what the value should have been.