The previous owner replaced the broken lamp with blue LED (with resistors to reduce the voltage). That works but is quite ugly to me. I bought some 12V lamp from amazon (halogen?) (intended for car dashboard) ( uxcell Instrument Light 12V T3 計器灯 12V T3 イエロー 自動車 車内 ダッシュボード ). Nice stuffs. Works out great (need to remove the resistor installed by the previous owner). Note: without the lamps installed (or with only one or two lamps), the voltage seems too high (15V without lamps and extra resistors if memory served), but with all lamp installed, voltage drops to only about 10.5V. Seems pretty safe and it is bright enough.
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