There are plenty of modders who do full service on the Oppo players. But I have come across an amazing upgrade that can be done by anyone in 5 minutes.
Dr Lee Jaehong is based in South Korea and makes a replacement linear power supply for the Oppo and Cambridge Audio Blu-ray players.
http://www.oppomod.comYou just take out the 5 screws for the old SMPS, and drop the new LPM in. Nothing difficult. I actually have a Cambridge Audio BD751, and the upgrade was pretty dramatic for audio and video, in every aspect.
Apparently many are saying this power supply in the Oppo103 takes it past the level of 105, and you get all round better video quality as a bonus.