E-unit on Lionel C&O 624 Switcher was replaced by QSI E-unit & sound system prior to my purchase 10 yrs ago. Sound system works but E-unit has stopped working. Replaced rechargable battery with alcaline but no help. Where can I get literature on QSI or a tech support/repair service for QSI E-unit? How do I identify which QSI do I have?
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