As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 5504 - STL - HYDRAULIC SYSTEM NR 1 "LOW QTY" MESSAGE ON THE EICAS WITH GAUGE SHOWING AT BOTTOM OF THE AMBER BAND. MAINTENANCE INSPECTED AND FOUND A LOOSE FITTING IN NR 1 HYDRAULIC BAY. FITTING WAS SECURED AND THE SYSTEM INSPECTED FOR FURTHER DEFECTS WITH NO FINDINGS.