What was found
LEFT PACK LIGHT ILLUMINATED IN FLIGHT. RAN QRH. PACK LIGHT CONTINUED TO FLICKER ON/OFF INTERMITTENTLY. GROUNDED - YES. VERIFIED L/H PACK LIGHT IS ILLUMINATING + WILL NOT EXTINGUISH. CKD FLT DECK EFFECT. FOUND MSSG 21-55100. ACCOMP. A/C SYS TEST IBIT L/H. TEST PASS. L/H PACK LIGHT STILL ILLUMINATING. REF M/M 21-00-00-730-801. ACCESS L/H A/C BAY ACCOMP. GVI NO DEFECTS CLOSED L/H PNL SWINDSOR 80780 10/29/2023 REMOVED AND REPLACED AIR CONDITIONING MODULE. OPS NORMAL. RAN BOTH PACKS AT FULL HOT FOR 10 MINUTES. NO FAULTS. RAN BOTH PACKS AT FULL COLD FOR 10 MINUTES. NO FAULTS. REF AMM 21-51-65/401.