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