As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT HYD SYSTEM QTY IS 0.02; R HYD QTY EICAS MSG DISPLAYED. SAMC TEXT: WITH RT QTY LOW LIGHT ALSO. TOMC MAINT TEXT: PER CREW, PUMP LOW PRESS LIGHTS DID NOT ILLUMINATE PRESSURE NORMAL. NO SIGNS OF EXTERNAL LEAKAGE. REPLACED HYD QTY MONITOR UNIT PER MM, QTY SYS CKS NORMAL.