Laser cuts fine on left side of the bed but fades out or doesn't cut on right side.
99% chance this is an alignment issue. Either the beam is not centered on the mirrors reflecting down or the laser is being clipped inside the air cone as it travels through the cone. Follow the mirror alignment guide to solve this problem.
Lasers only travel in a straight line and the power does not degrade at all over distances of 5ft which is the max the traveling distance on Muse Titan 48x24. Thus the only issue is the mirrors are out of alignment. There is no need to check the laser tube or laser power supply if there is sufficient cutting power on the left side which is the closest to the laser output.
You can use this test to check your Alignment down the Air Cone.