As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFR FLIGHT 2125 UPON GEAR RETRACTION, RECEIVED NR 2 ENGINE HYDRAULIC PUMP CAUTION LIGHT, NR 2 MAIN PRESSURE DROPPED TO -0-. FLUID LEVEL REMAINED NORMAL. RAN CHECKLIST, CAUTION LIGHT EXTINGUISHED AFTER APPROXIMATELY FIVE MINUTES. MAIN HYDRAULIC PRESSURE RETURNED TO 3000 PSI. MAINTENANCE COMPLIED WITH DHC 8 200 AMM MAIN SYSTEM CYCLING TEST TASK 29-00-00-730-801. NO DEFECTS NOTED. NR 2 SYSTEM HELD PRESSURE DURING TEST. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.