What was found
FLT JB242 LGB-OAK AIR TURNBACK TO LGB DUE TO WHILE AT CLIMB THRU 9000 FT ADS 2 HEATER FAIL, ADS 3 HEATER FAIL, ADS 4 HEATER FAIL EICAS MESSAGES APPEARED. CREW ACCOMPLISHED QRH PROCEDURES AND RETURNED TO THE FIELD AND LANDED SAFELY. LGB MX PERFORMED TROUBLESHOOTING IAW TSM 30-31-00-810-804/805, NO FAULTS NOTED. PERFORMED FHDB DOWNLOAD ANALYSIS SHOWS ADS PROBE NR 3 CHANNEL A TRIPPING. REMOVED AND REPLACED NR 3 ADS PROBE PER AMM 34-13-01 ACCOMPLISHED PITOT STATIC/AOA SENSOR HEATING ADJUST/TEST IAW AMM 30-31-00-710-801-A. OPS CHECK NORMAL, NO FAULTS NOTED ON EICAS. AIRCRAFT RETURNED TO SERVICE.