Hi Stan,
glad to hear you had some success. Thanks for the update. I'm not sure what the numbers mean, but they are more likely to be a batch or date code, or possibly a type code, rather than a rating. Continuous ratings aren't much use for relays controlling incandescent bulbs. The initial current, when the relay contacts make (and bounce), is many times higher than the final current because the bulb filaments have much lower resistance when cold.
As you've found, you can clean up the contacts, but don't expect them to last. The unevenness of the contact surfaces will accelerate further erosion. I recommend you replace the relay when time permits. Having gone through the procedure once it's easy to get the module out and fix it.
Regards,
Dev
Thanks Dev for responding, interesting to know why a higher rating is reqd, not familiar with electrical intracacies, I'll obtain a 12v/20Amp relay and make a permanent repair. Stan