About 12 years ago I repaired a 2213A power supply and the main problem was T948. So basically yes, you are probably correct in your assumption that your T948 is bad as well, as it has happened before. Before getting a replacement donated from another member I really tried the all usual everything under the sun checks and part replacements to try and fix the problem but of course nothing worked and in the process I rather ended up also burning some freshly replaced components. I think you need to search for a parts/junked 22xx scope or just the main board as I was lucky enough to get it, and hope T948 is good and move ahead by replacing it. This power supply is extremely finicky and temperamental, and very intolerant of mistakes, there is no middle ground, its either fully working or not. In the end in my case it was the very last part I replaced that fixed everything after about 6 weeks of hunting down the cause.
