Performed maintenance on both air handlers and condensers for unit 406 and 406 a. Checked all voltages and amperage and capacitor‘s all are OK at this time. Checked float switches all are OK at this time. Both air handlers have blue lights in both, bulbs burnt out and not operational at this time. Need to replace both these bulbs I have taken pictures with models to re-order if customer chooses to do so. Add in a note whoever comes for next maintenance make sure you get a master key as well as the regular keys the master key is the only one to open doors to service air handler’s.