What was found
PIT FLT1174 FLIGHT DEPARTED CLT WITH THE NR 2 CSD ON MEL AND THE RT BUS BEING POWERED BY THE APU. ON CLIMB OUT, CREW REPORTED THE RT BUS DROPPING OFF LINE INTERMITTENTLY. OCCURRED 2 MORE TIMES ON LEVEL OUT. CREW WAS ABLE TO REINSTATE EACH TIME BY CYCLING APU GENERATOR SWITCH. FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT AT PIT. MX FOUND A LOOSE WIRE CONNECTION ON APU GENERATOR. SECURED WIRE. COULD NOT DUPLICATE BUS DROPPING OFF LINE. OPS CHECK GOOD. CLEARED MEL ON NR 2 CSD WITH THE REPLACEMENT OF THE NR 2 CSD. OPS CHECK AND LEAK CHECK GOOD.