What was found
CLIMBING THROUGH FL200, RECEIVED A LEVEL 2 STAB OUT OF TRIM WARNING. SWITCHED AUTOPILOT IAW QRH. AUTOPILOT 2 WOULD DISCONNECT BECUASE OF STAB TRIM INOPERATIVE. AUTOPILOT 1 CONTINUED TO DISPLAY STAB OUT OF TRIM. INTERROGATED BOTH FCCS. NR 1 FCC HAS NO FAULTS FOR LAST SEVEN FLT LEGS AND NO CURRENT FAULTS. NR 2 FCC HAS A CURRENT FAULT OF ELEV ACT-RIB. FCC NR 2 HAS SEVERAL RECORDED FAULTS FROM LAST FLT LEG: FCC-2. ELEV ACT-LOB, ELEV ACT-RIB. ELEV ACT-RIB. ELEV ACT-RIB. ELEV ACT-LOB AND FCC-2. ELEV ACT-RIB, ELEV ACT-LOB. SHORTLY AFTER ALIGNING IRUS, RECEIVED SEL LSAS RIB OFF AND SEL LSAS LOB OFF ALERTS WITH ACOMPANYING LSAS CHANNEL FAILED MESSEGES. ACCOMPLISHED NR 2 FCC RTS AND RTS FAILED WITH NR 2 FCC BEING THE PROBABLE CAUSE. MX PERFORMED AMM 22-00-00-5. REMOVED AND REPLACED THE NR 2 FCC STAB TEST PASSED IAW AMM 22-01-03-4, ACFT OK TO CONTINUE.