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Thank you for sharing all of your tips with the whole world. Of course, it is not state of the art to replace an SOT89 SMD component with a TO92 through-hole component, but firstly it would have taken some amount of effort to get the SOT89 variant and secondly it is yet a robust and well-functioning replacement in this case (fitting pinout and leads, no thermal or mechanical aspects to be considered). As you can see on the photos I also replaced IC53, which stabilised at 4.5 volts and not 5.0 volts. So I replaced C100 and patched the broken trace by scraping off a bit of solder resist and bridging it with solder. Then I noticed that one of the C100 capacitor’s leads had been „eaten“ by the acid and - more important - the +12 volt trace below the lead had also been etched away. While measuring I found that the negative leg around the IC52 (79L05) was operational but IC53 (78L05) floated around at 0 volts on it’s output and input. I replaced the two evil caps, connected the mainboard and powered up the 01/W, but there was no sound. What has been left over from the „acid attack“ on my 01/W did not look dramatic at first. And the cleaning should be repeated a few times with fresh swabs. There’s no need to spare with the isopropanol, it does not do any harm to electronic components and evaporates without residue. To clean this type of mess I prefer cotton swabs heavily soaked with isopropanol (isopropyl alcohol).