What was found
AFTER T/O PASSING 6000' PITOT HEAT STDBY SYSTEM FAILED. PITCH TRIM NR 2 TRIPPED OFF, ATS LEVER 1, TRIPPED OFF, NR 2 FLIGHT DIRECTOR FAILED; MAINTENANCE; CL; & CR LIGHTS ON TRIP STARTED FLASHING. MTP FAULT REPORTED NOSE GEAR RELAY - FAC NR 2, NOSE GEAR RELAY- TCC NR 1, & NOSE GEAR RELAY FAIL. BITE PDPU 54GB FOUND FAULT CODE NR 12 THIS IS AT CONFIG OF 82GB C/P DISCONNECTED AS WRI 32-30/7468, EA 6-3230-T0303719, PT1 IS COMPLIED AT CANMX. RECONNECTED BACK 82GB C/P CARRIED OUT BITE AT PDPU ALL NO FAULT FOUND IAW TSM 32-61-00. WIRING CONN CHECK & SHORT TO GROUND CHECK FROM 82GB PROX DET NLG TO 54GB PROX DET UNIT IAW WDM 32-62-08. ALL NO FAULT FOUND, REF TO TSM 32-61-00, PAGE 107 AT "ATA 22 ITEM NR 4" HIGHLIGHTED THE POSSIBLE CAUSES OF PITCH TRIM 2 DISENGAGES, AP2 TRIPS AND A/THR1, TRIPS IS RELAY 96GB, PROXIMITY DETECTORS 82GB, & PDU CHANNEL 12. IN PROCESS OF 54GB PDU ASSY AND 96GB RELAY REPLACEMENT. RELAY 96GB R & I IAW ESPM. 54GB PDPU R & I AND BITE OK IAW AMM 32-31-71-04. RELAY 96GB AND PDPU 54GB REPLACED. CONNECTOR PLUG OF 82GBA OR NHA WIRELOOM TO BE REPLACED. RELAY 96GB R & I IAW ESPM. 54GB PDPU R & I AND BITE OK IAW AMM 32-31-71-04. R & R LOOM ASSY (82GB C/P INCLUDED) R & R RELAY 96GB. R & R PROX DET UNIT 54GB. EA6-3230-T0303719 PT2 IS COMPLIED. JACK UP ACFT AND PERFORMED GEAR NORMAL RETRACTION AND EXTENSION TEST WITH SYS 1 AND SYS 2. TEST SATISFACTORY.