What was found
DURING CRUISE ALTITUDE. AGENT 2 LOW LIGHT ILLUMINATED. NO INDICATION OF ABNORMAL ENGINE OPERATION NOTED. NO OTHER ASSOCIATED LIGHTS. THE FLIGHT CONTINUED AND LANDED WITHOUT FURTHER INCIDENT. TROUBLESHOOTING FOUND ALL THE SQUIBS UNFIRED. BUT THE BOTTLE WAS EMPTY. REPLACED FIRE EXT BOTTLE IAW MM 26-20-01. OPS CHECKED FIRE BOTTLE SQUIBS IAW MM 26-20-03. CHECKED TAIL COMP FOR PNEUMATIC LEAKS. NONE FOUND. ALL CHECKS NORMAL. THE AIRCRAFT WAS GROUNDED.