What was found
RA FLAG AND AUTOPILOT DISCONNECT. FO SIDE NOT ABLE TO USE NOSE UP TRIM.F/O STAB TRIM SWITCHES NOSE UP TRIM INOP. ACCOMPLISHED BASIC GVI OF VISIBLE CONTROL CABLES IN FWD&AFT E&E BAYS, WHEEL WELL, AND JACKSCREW COMPARTMENT, NO DEFECTS NOTED. FOUND EXCESSIVE MOISTURE ON STAB TRIM ACTUATOR BUT NO OTHER OBVIOUS DEFECTS ADD EMP:U348947 NOTED. FOUND NO CBS POPPED IN COCKPIT OR E&E BAY. FURTHER T/S REQUIRED. LOOKED AT THE AFCS FAULT HISTORY AND FOUND 3 IN FLIGHT FAULTS #2 RAD ALT. ON CHANNEL B, NONE FOR CHANNEL A. SEE PHOTOS. REMOVED FCC B AND FCC A IN REFERENCE TO AMM 22-11-33-000-801 TO FOM. REM OVED #2 RAD ALT IN REFERENCE TO 34-33-21-000-801 TO FOM. CHECK W IRING FOR CONNECTOR D10137B PIN B4 AND A4 TO CONNECTOR D3669B PI N B2 TO B3. WIRING CHECKED GOOD, NO SHORTS OR OPENS. SUGGEST REP LACING FCC B DUE TO CORROSION ON THE BACK SIDE OF LRU. PHOTOS SSM 34-33-21-104 USED FOR RING OUTS. INSTALLED #2 RAD ALT IN REFERENCE TO B737 AMM 34-33-21-400-801. INSTALLED FCC A IN REFERENCE TO 22-11-33-400-801. CAT REQUIRED FOR OPS CHECK PERFORMED LOW RANGE RADIO ALTIMETER (LRRA) SYSTEM - OPERATIONAL TESTREFERENCE: TASK 34-33-00-710-801. TEST PASSED. PERFORMED BITE ON BOTH R/TS. NO FAULTS. SEE LP 8653356 FOR OPS CHECK OF STABILIZER TRIM FUNCTIONS. REMOVED AND REPLACED.