Yet Another 787 Mechanical...

A JAL Boeing 787 Dreamliner made an emergency landing at HNL after oil pressure in its right engine dropped, the Japanese carrier said.
The twin-engined jet en route to SFO from NRT diverted to HNL, landing at 13:43 local time Saturday with 160 passengers on board, a spokesman for JAL said. No one was injured in the incident.
"We are investigating the cause of the drop in oil pressure," the spokesman said. The 787 is still parked in Hawaii, he added.
The jet is the same one on which a battery melted and emitted smoke at Boston's Logan airport in January last year. A subsequent battery overheating on a 787 operated by ANA several days later prompted regulators to ground the global fleet of carbon composite 787s for more than three months.
Investigators in Japan are also probing a battery that overheated on a JAL 787 parked at Tokyo's Narita airport in January this year.
Authorities have yet to discover the root cause of any of those meltdowns. They allowed Boeing to return the 787 to operation after it redesigned the battery with insulation, a vent to eject any hot gases out of the aircraft, and encased it in a steel box to contain any fire.