What was found
LEFT BLEED AIR LEAK LIGHT ILLUMINATED AFTER DEPARTURE FROM DTW. PERFORMED ORH, LT BLEED AIR LEAK LIGHT EXTINGUISHED WITH LT BLEED CLOSED, WITH LT BLEED CLOSED THE LT BLEED AIR LEAK LIGHT ILLUMINATED. ATTEMPTED RESETS, ALL ENGINE PARAMETERS APPEARED NORMAL. MAINTENANCE REPLACED PERI-SEALS ON LT WING BLEED AIR COUPLING, RAN AC AND PERFORMED BLEED LEAK TEST. ALL CHECKS GOOD.