What was found
AFTER TAKEOFF, GEAR DIDN'T RETRACT & INDICATED THREE GREEN, ONE RED. RECYCLED GEAR WITH NO CHANGE. BOTH "ENG CONTROL FAULT" LIGHTS ILLUMINATED & DIDN'T EXTINGUISH AFTER RESETTING, IAW CHECKLIST. ACFT DIDN'T PRESSURIZE & BOTH THE TCAS AND TRANSPONDER MALFUNCTIONED. "LO BRK PRESS" & "ANTISKID INOP" ENUNCIATORS ILLUMINATED WHILE GEAR HANDLE WAS UP. SHORTLY AFTER, PUT GEAR HANDLE DOWN, LIGHTS EXTINGUISHED. "ENG CNTRL FAULT" ENUNCIATORS FUNCTIONED NORMALLY AFTER BATTERY "OFF" & BATTERY "BATT" ACCOMPLISHED IAW CHECKLIST. R & R PCB NZ046 & NZ044 IAW MM 24-51-02. LANDING GEAR OPS CHECKED GOOD IAW MM 32-01-00. TCAS OPS CHECKED GOOD IAW MM 34-42-04. TRANSPONDER OPS CHECKED GOOD IAW MM 34-54-05. COMPLIED WITH GROUND RUNS, NO FAULTS NOTED. FADEC OPS CHECKED GOOD IAW MM 76-14-00. PRESSURIZATION OPS CHECKED GOOD IAW MM 21-31-00. ANTI-SKID OPS CHECKED GOOD IAW MM 32-40-00.