B767-300 and 300 ER
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 150; Flight Crew Total 13000; Flight Crew Type 9000
Aircraft Equipment Problem Less Severe
Flight Crew Landed in Emergency Condition; Flight Crew Diverted
Aircraft
Sometime after passing ZZZ we had a C HYD SYS PRESS EICAS caution. We ran the QRH and could not establish normal pressure to the Center HYD System. We noted there was full Center HYD quantity on the lower EICAS screen. The C HYD PRESS checklist required us to alternately extend the flaps and gear; so we decided [requesting priority handling] was appropriate. We contacted Flight Control and talked to our Dispatcher and Maintenance; informed them of our intention to [request priority handling]. Based on familiarity with ZZZ1 and their long runways; the Dispatcher concurred it was the best choice and had good weather; so I elected to land there. We got an ARTR (alternate route) for the new destination. When we started configuring the flaps; we had a LE ASSYM EICAS. We reviewed the LE ASSYM checklist; and rechecked everything and noted that the LE slats were definitely in their proper positions. We contacted Flight Control again and talked to Maintenance to discuss options and see if we were missing something. Based on all available information we had; we determined the aircraft slats were in the takeoff position. We also noted the LE ASSYM EICAS message vanished on its own. The Alternate Flap and Gear Extension operated normally. ZZZ1 had emergency services standing by for us. On short final (approximately 200ft) we had another odd thing happen - the PLI (Pitch Limit Indicator) started to move erratically and jump up and down and the stick shaker briefly activated. The aircraft was stable and on flaps 20 ref speed of 140 (I added 5 more knots for a VApp (approach speed) of 145) with very light winds. The PLI erratic movement made no sense; but I increased power and lowered the nose a bit; and we touched down uneventfully. Emergency services checked the aircraft out once we pulled off the runway and they noted no hydraulic leaks or other fluids coming out of the aircraft. We were light enough that only moderate braking was used. We took plenty of time to review checklists and make sure we didn't miss anything. I cannot explain the spurious PLI movement or the transient LE ASSYM EICAS message.
B767 Captain reported multiple EICAS messages resulting in a diversion and a precautionary landing.