saba: SABA Freiburg 100 relay for “on/off”

My SABA Freiburg 100 seems to be working well except for one thing. The On/Off push button is not working. It seems the relay that is activated to switch the radio on and off is very intermittent. I think it may be a mechanical problem as there is small lever that the opens and closes the contacts gets stuck in one position. 
Is this a common problem with these radios? Is there an alternative such as fitting a modern relay?

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I seem to have resolved this problem. The spring under the relay assembly was incorrectly fitted.

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