Be glad that you have a re-workable module that is reasonably well made. I've seen far worse then that.
There is a slight chance that the epoxy "relaxed" on the cylindrical lens mount over time. In which case, thin steel shim stock (.001 inch or .005 inch) from McMaster-Carr becomes very useful to correct any lens tilt. You shim the lens by putting stock under it's base. Check the optics for dust inside the collimator. Otherwise Buffo nailed it.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...