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There have been a number of threads on this recently on the makerbot-operators group: your Replicator has one of it's three heater sensors not plugged in, shorting, or intermittently not registering. It could be the wiring connector to the HBP is failing, or one of the thermocouple wires is failing, or one of the thermocouple beads has broken through the kapton tape which insulates it from the heater block, or the wires for any of these three sensors need to be tightened down. But, from the firmware side of things this means that the firmware is having repeated errors trying to read the temp for whichever sensor is being reported as 1024C.