I have noticed I am missing a cap on a target. Can there be a reason why it may have been removed. It reports as being ok on the switch test. Also I found some of these Greencap 47nf 100v. Would they do as replacements or do I need to make a special trip after work down the dreaded Western Ring Road 
"473" denotes 0.047 microfarad, which is the same as 47 NanoFarad. I think that is right !
