SATCO.... "That Lighbulb is non-op!"
Watch Manager.. "So it is"......thinx....."Tower Supervisor, there is a none functioning desk illuminating item there"
TWR Sup to long suffering ATCA [it's
his lightbulb..."Call engineering, PDQ to fix said item"
ATCA applies his accumulated knowledge and "thumps" the offending item. Result...It works
Answer
none , all you need is a good ATCA
watp,iktch