What was found
AT TOP OF DESCENT UPON MASTER RECALL, LEFT PACK ILLUMINATED. UPON RESET OF MASTER CAUTION, LEFT PACK LIGHT CLEARED. GROUNDED - YES. CONFIRMED LT PACK OVHD ANNUNC ILLUM W/MSTR RECALL. PERF'D BITE TEST OF PACK/ZONE TEMP CONTROLLERS PER AMM 21-61-00. UPON INITIAL EVAL FOUND CONTLR NR 1 W/"TCV THIS PACK" RED FAULT LAMP ON IN PREVIOUS FLIGHT FAULTS. CONTINUED W/TEST AND CONTLR NR 1 OPS NRML - FAULT LAMP EXTINGUISHED. SUBSEQUENT TEST OF BOTH CONTLRS PER ABOVE AMM REF OPS NRML W/NO FAULTS DISPLAYED. L PACK ANNUNC NOW REMAINS EXTINGUISHED W/MSTR RECALL.