That's an oldie but goodie.
     I had something similar happen to me while I was stationed at
Moody working F4s back in the 80s.
     A semi new Weapons System Officer wrote in the aircraft forms,
Radar does not work in O.F.F. mode.  Now we weapons control guys
were running a 60% Could Not Duplicate rate on silly writeups like
this, so I decided to be a wisenheimer.  I corrected the problem by
asking the next WSO to fly if the radar worked in "OFF" mode. 

    After getting a strange look, he told me it was indeed turned off
when in off mode.  So I wrote in the forms "Replaced stick actuator,
Systems ops checked ok".  
     Got away with it for about 6 hours until the boss was checking 
forms at shift's end and made me change it.  

P.S.  The stick "actuator" was the radar operator.