What was found
(LOG 4283678) AT 2000' AGL, "EQUIP COOLING EXHAUST OFF" LIGHT ILLUMINATED. LIGHT CLEARED 1 MINUTE LATER CHANGE IN SOUND NOTEABLE. ON ROLLOUT ACRID BURNING SMELL LASTED 90 SECONDS IN COCKPIT ONLY. T/S ACRID BURNING SMELL IN COCKPIT PER B737 FIM 21-00-00-810-806 RAN APU & LEFT PACK ON APU BLEED AIR, INSPECTED APU INLET FOR FLUID CONTAMINATION, CHECKED HYD SYSTEM SERVICING, INSPECTED EQUIPMENT COOLING FANS FOR OPERATION AND ODOR. NO DEFECTS OR DISCREPANCIES NOTED. R/R RECIRC AIR FILTERS PER B737 AMM 21-25.