I just sent my 83se in for a new loader as I have been having intermittent disk reading errors for a few months and I also wanted to get a replacement loader, while they are still available.
The tech evaluation from Oppo said that there was accumulated dust in the loader.
This may have been the cause of my read problems. I was surprised to read this as I just opened up my fan cooled DLP and found liltle dust after 2 years. Had I suspected dust accumulation in the oppo I would have removed the cover and cleaned it, which is what I probably should have done in the first place. Doh!
I did periodically use a lens cleaning disk.
So FWIW I would recommend pulling the cover off and inspecting for dust periodically, it could save on repairs and improve disk reads.
The cleaning procedure has been documented in this forum I believe.
Mitsubishi WD73-742, Oppo BDP-103, Gallo Classico CL-4/Classico CL-C Center/ Adiva-ti surrounds, Emotiva UMC-200/ XPA-5/ XPA-3, Toshiba HD-A3. Roku XS "All rooms, speakers and ears are different, trust your own ears."