As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YVR FLIGHT NR 2039 - NR 2 SPU AUXILLARY POWER CAUTION LIGHT. MAINTENANCE COMPLIED WITH OPERATIONAL TEST OF THE SPU IAW DHC-8200 MM 29-11-17, OPERATIONAL CHECK GOOD. NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.