One note of 'CAUTION' that is universal... especially with multiple 'failing' EE-EL components.
Electrical wiring interconnects between sensor and receiver need to be verified/validated.
I have been involved in numerous situations where electrical components appeared to be faulty or intermittent... only to discover discrepancies in the wires or components....IE: cannon-plugs and/or worn/abraded wires, filthy/damaged/missing connectors/pins [male/female], damaged moisture/oil seals, etc.
In one particularly subtle case an electronic component [black-box] was 'maddingly' intermittent [could not duplicate, CND]. Routine trouble shooting was getting no-where... black box checked-out OK every time. FINALLY an experienced electrician was re-installing the box: just before re-inserting the cannon plug, he pulled-out a flashlight to look inside the female connector of the aircraft wiring... and was shocked to see dirty/scored pin receptacles with metal shavings. The connector was serviced[replaced?] and pins lubricated. It became 'shop practice' to carefully inspect the connectors on the jet wiring... and lubricate the pins [special EE-EL compatible lube] before installing connectors. Ta-Da... that took care of many CND problems.
Regards, Wil Taylor
o Trust - But Verify!
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", HBA forum]
o Only fools and charlatans know everything and understand everything." -Anton Chekhov