Heat rise 32 degrees. Cleaned indoor fan. Indoor voltage enhancement system within rated factory spec. Found refrigerant leak on indoor heat transfer system. Do not recommend repairs due to age of system. Scoped combustion chamber and found no areas of concern. Cleaned burner system and flame safety system. Static pressure is .79inWC. Indoor fan amps 2.7. Exhaust removal system amps 2.6. Gas pressure is 9.76inWC. Refrigerant pumping system reads 400-300 megaohms.