As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 HYDRAULIC SYSTEM INDICATED ZERO PERCENT AT FL290 EN ROUTE TO BUF. RAN QRH AND DIVERTED TO PHL. FOUND PRESSURE LINE FROM EDP NR 1 TO PRESSURE FILTER CRACKED AT PRESSURE FILTER CONNECTION. REMOVED AND REPLACED PRESSURE LINE, REMOVED AND REPLACED EDP NR 1, REMOVED AND REPLACED PRESSURE CASE DRAIN, RETURN FILTERS, SERVICED HYRAULIC SYSTEM NR 1. LEAK CHECK AND OPERATIONAL CHECK OF SYSTEM NR 1 IAW CRJ AMM 29-11-01. LEAK CHECK AND OPERATIONAL CHECK GOOD.