What was found
SEA FLIGHT NR 2077 INFLIGHT, NR 2 SPU AUX POWER CAUTION LIGHT ILLUMINATED RAN APPROPRIATE CHECKLIST NO OTHER CAUTION LIGHTS AT THE TIME. MAINTENANCE GROUND RAN ENGINES FOR AC POWER 2 SPU AUX POWER CAUTION LIGHT REMAINS EXTINGUISHED WITH AC GEN POWER APPLIED. UNABLE TO INDUCE LIGHT IN NORMAL CONFIGS. CHECK GOOD HYDRAULIC PRESS FROM 2 STBY GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.