Well I am completing an ultra deep rebuild of a CR-2020 (a rebuild thread will be posted later this year) and finally powered up the unit last night. All working and adjusting just fine, discovering that the POWER LED is not working while the required 20V is across it as it should be. So, does anybody know if there is more to it like a build-in resistor or zener diode? And ultimately.... would anybody have a spare laying around from a donor unit? They must have been used in other Yamaha gear of that era. It's the left one in the photo, but they are all the same.