{HEAD ~ An indication} of {TAIL ~ such faulty operation} is made to effect sensor repair or replacement 
of
{ HEAD ~ An indication } of { TAIL ~ such faulty operation } is made to effect sensor repair or replacement
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH