What was found
REF WRI 34-14/2166 THE CAPTAINS ALTITUDE INDICATOR MOVED ERRATICALLY /- 1000 FT NORMAL INDICATIONS DURING CRUISE AND DESCENT (ITEM SEPERATED FROM ORIGINAL WRITE-UP. REF MM 34-26-00-0, NO PREV FLT FAULTS FOR AOA, BARO, ADM, TAT RECORDED IN INERT REF MODE PANEL. INSURED CAPT BARO SET KNOB MOVEMENT IS SMOOTH. REF MM 34-11-00-3, INSURED NO DEBRIS IN CAPT PITOT/STATIC SYS BETWEEN PROBE AND ADM. RESET L ADIRU AND CHECKED GOOD PER MM 34-26-00-5. DUE TO CAPT ALTITUDE FLUCTUATING, INSTALLED NEW CAPT STATIC ADM M11262 AND CHECKED GOOD PER MM 34-26-03-4. PERFORMED PITOT STATIC SYS LEAK CHECK AND INST CHECK PER MM 34-11-00-5. NO FAULTS NOTED. AC OK FOR SERVICE.