I just found out that the 91-125 error code for the UVW-100 is an internal systems board error relating to the viewfinder and/or the LCD display (where the time code and audio meters are). I was having a problem with the LCD display not working. Luckily, the error code went away while I was on the phone with Sony tech support, and the display works fine now. Incidentally, their broadcast support number is 866-766-9272.