Sometimes the right advice is not the same as the advice you want to hear. A burglar alarm is not the same as a vintage car, no one is going to come and admire it when it goes off in the middle of the night, like they would when your on the London to Brighton in your vintage car.
Preserving an old bit of kit is normally less cost effective than replacing it with something new. So if you replace the transformer, you still have a ten year old PCB with ten year old components.The panel been on on 24/7 for the last ten/eleven years, its beginning to fail. It has served you well, just remember the good times you had with it turning it on and off, and do yourself a favor and update it.