Service/Charge Aircraft Batt. Tighten Alternator belt. Cleaned Batt Cables. Replaced Volt Regulator P/N DGR6-1. Cleaned Eng. Air Filter. Replaced rubber cowl mounts @ Firewall (4 ea), P/N J7444-42. Adjusted Exhaust Shroud on Muffler. Test run engine to check for proper voltage with elect load satisfactory. Return to Service.