Small issue with my projector

[El Guaraguao]

After taking out the light bulb housing for cleaning, I turned on my projector to find this, that darker vertical line on the left side of the screen. Ive taken out the light bulb housing numerous times for cleaning and this is the first time I see this. Anyone have any ideas?



also - Sorry for the quality of the pic and No, I don't use that as my monitor lol.