What was found
SUSPECT OUR ELT IS ACTIVE. HAVE BEEN LISTENING TO A STRONG ELT SIGNAL ON 121.5 FOR MOST OF FLIGHT. DUPLICATED TONE PRESENT ON BLOCK IN, WHILE LISTENING TO 121.5. ACCESSED ELT UNIT & PLACED SWITCH TO OFF, TONE CEASED ON 121.5. R & R ELT UNIT IAW M/M 23-25-01-4. NO AUDIBLE TONE HEARD ON 121.5 WITH SWITCH IN ARM. UNABLE TO COMPLETE ELT SYS, ADJUSTMENT & TESTED IAW MM23-25-01-5 DUE NO TESTER PN 455-9100 OR EQUIVALENT AVAILABLE IAW MM 23-25-01-5. COMPLETED 121.5 AUDIBLE TEST. TESTED SATISFACTORY, STILL UNABLE TO VERIFY 406 MHZ DIGITAL FUNCTION, DUE TESTER HAS NOT ARRIVED.