What was found
AUTOPILOT FAILED TO CAPTURE ALT SEVERAL TIMES DURING CLIMB OUT IN PROFILE. RATE OF CLIMB WAS BETWEEN 3000 & 4000 FT PER MIN. ALSO, CAPTURES ALT VERY SLUGGISH, TENDS TO FLUCTUATE - 500 FEET FOR ABOUT A MIN BEFORE FINALLY CAPTURING ALT. DURING DESCENT IN PROFILE AUTOPILOT CAPTURED ALT BUT THEN STARTED TO OSCILLATE - 500 FT PER MIN, HAD TO MANUALLY CAPTURE TO STOP OSCILLATIONS. UNABLE TO DUPLICATE DISC AUTOPILOT SYS 1 & 2 TEST NORMAL IAW AMM: 22-10-00-05 & 22- 40-00-05 AUTO LAND TEST. RESET 30 AUTO LAND CLOCK. FMC'S 1 & 2 ALSO TEST NORMAL IAW AMM 34-60-00-5. 1 & 2 ADC'S TEST NORMAL IAW 34-10-00-5. VISUAL INSPECTION OF AIR DATA RELATED PORTS REVEALS NO DEFECTS. ACFT WAS RELEASED WITH MEL FOR NO RVSM OPS.