What was found
ADS 2 HTR FAIL IN FLIGHT. RETURN TO FIELD. LANDING UNEVENTFUL. REMOVED FROM SERVICE. REMOVED ADS PROBE 4 HTR RELAY K17 IAW TASK 24-55-02-040-037-A01. REMOVED ADS PROBE NR 4 IAW E175 AMM TASK 34-13-01-000-801-A. MEGGER CHECKED PINS 30 & 35 ON P1804 & P1802 TO RELAY K17 BASE, CHECKS GOOD IAW WM 30-31-50 PG. 1 OF 2. INSTALLED NEW K17 RELAY IAW TASK 24-55-02-440-018-A01. ISTALLED NEW NR 4 ADS PROBE IAW AMM TASK 34-13-01-400-801-A, ALL CHECKS GOOD. C/B ADS HEATER 4 STAYS ENGAGED.