Upon arrival found flame rollout switch tripped. Manually reset rollout switch checked gas pressures and did combustion analysis on furnace. With a temperature rise found furnace is operating very hot even adjusted gas pressure is down to 2.8 inches of water column furnace still operating with 80° split. 10° over rated temperature with cabinet in top of Furnace getting extremely hot. Can be a fire hazard expressing concerns to customer system manufactured in 1993. Is your furnace being 23 years old recommending furnace replacement due to problems found in safety concerns.