Scott Williams, in 34 yrs I’ve never replaced an optic sensor, This model has had several issues that have caused little to no ice. Before spending all that money do these checks. I’ve started with the easiest checks first
Get an exact temperature of the ice room. The ice maker wont advance if the temp. is above 9*F
Bypass the water filter by removing it and adjust the ice setting to MAX ICE or fast ice - turbo ice. Check ice production in 24 hrs. If you have ice then you need to replace the filter and flush the line at the water dispenser at least one gallon of water to remove air.
Clean condenser coils. Dirty coils cause refer temperature to rise, thus, effecting ice production.
Look for signs of frost on back wall of freezer and fresh food section. Remove food, and even the drawer so you can feel the back wall. If you see any frost on any walls, floor, ceilings, then you need to completely defrost the unit by unplugging, remove all food and leave doors open for 2 days. Once you plug it in, allow 48 hrs for ice production. If everything works fine, for a few weeks then ice slows again, you have an issue that many have had. Diagnosing the defrost circuit and all fan motors to find the issues.
Do these checks in the order I listed. Let me know what you find.