When resoldering these relays (and in many other cases of dry joints on relays) always resolder the coil connections as well, these are the two small ones either side of the single large one on the picture shown for the less electronic amongst us. Due to thermal stress they can develop a hairline crack that is not obvious to see unless a good magnifier is used. I repaired one of these units about 18 months ago and the power connections were fine, it was the coil connections giving trouble.
When resoldering any connection of this type, particularly where the joint has started to burn and fill with oxides use a "solder sucker" to remove the old dross first and replace all the solder with fresh. I add some solder to the dry joint to get it to flow, then suck the joint free of solder and then resolder with fresh solder. Failure to do this and the joint is likely to fail again very quickly. Solder suckers are easily available from Maplin, RS Components, CPC Components etc. for very little money.
Shaun
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