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Look at the front door that you open when you change the toner/drum. You will see that it has not closed properly at one end. Give it a gentle whack and the error should go. Very common problem as the catches can be stiff.
( 76 Heater harness disconnected or broken. Or heater thermistor harness disconnected or broken when the power is turned on, the front cover is opened and closed, or the machine exits from the sleep mode. ) ( 77 Power turned off and on at the occurrence of error 76 or 78. ) ( 78 Heater thermistor short-circuited. Or heater thermistor harness disconnected or broken when the machine is on standby. )