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Is this an oil or gas fired unit?
Ok, sounds like 2 separate issues. The loud noises are a potentially serious issue, delayed ignition. It must be corrected before something catastrophic happens. I wouldn't use the boiler until this is fixed. What the gas company told you is only partially right. You can't get original equipment parts for this boiler any more but it can be retrofitted with new parts that have upgraded safety measures. The luke warm radiators sounds like circulation problem which could be due to a bad relay or a bad pump. Both can be replaced. You just need to find a plumber willing to do the upgrade. But I will allow that these days most plumbers only want to sell you a new boiler instead of fixing what you have.