What was found
PDIS 140 34-10 2316 26MAY19 MEM OPEN U LOGPAGES:2923349 "ALT DISAGREE" EICAS WARNING IN DESCENT. F/O AND CAPT ALTIMETERS HAD 250 FT DIFFERENCE. AT ALTITUDE THE SPLIT WAS 180 FT, BUT "ALT DISAGREE" EICAS IN CRUISE, FL360. PERFORMED PITOT STATIC TEST ON CAPTAIN'S AND F/O'S PITOT/STATIC SYSTEMS. RAN AIRSPEED TO 300KTS AND ALTITUDE TO 5000 FT AND 25.000 FT ON BOTH SYSTEMS. THERE WAS NO ALTITUDE SPLIT AT BOTH ALTITUDES AND AIRSPEED HAD NO SPLIT. LEAK CHECK ON BOTH CAPT AND F/O'S SYSTEMS CHECKED GOOD. ALSO PERFORMED TEST 30 AND ADC TESTS; ALL CHECKED GOOD WITH NO FAULTS. SYS OPS CK GOOD IAW AMM 34-11-00-5, 34-12-01-4, 22-41-00-5. RVSM CAPABLE.