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