As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/SYR - FLT 6379 - DURING CLIMB AT 1740 HOURS ON 7-29-98, MAKE AN UNSCHEDULED LANDING DUE TO BOTH HYDRAULIC PSI FLUCTUATED PLUS OR MINUS 200 PSI. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND SERVICED AND BLED HYDRAULIC SYSTEM, OPS CHECK OK. AIRCRAFT RELEASED AND RETURNED TO SERVICE. (X)