Bulb for Heater Control

We have a 2002 Accord EX V-6 4dr. The display that shows the temp, etc does not illuminate. At first, the dealer said that the bulb could be relpaced. Now they say the
entire heater control unit must be replaced at +$600.00. Is this possible? They changed the bulb in the clock for a few dollars. Thanks for all help! Paul
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