This is my first post and first Mac restoration project. I was given a Mac SE/30 that had been put on a shelf display and not used for 20 years. It had the simasimac problem and no startup tones. I removed the logic board and saw a few corroded spots from leaky capacitors, but overall, the board looked clean. I washed it with soap, water, and a toothbrush. Then I soaked it in 99.9% rubbing alcohol for 30 minutes and brushed and rinsed with alcohol again. After drying it for a few days, I replaced the capacitors with the tantalum capacitor kit from console5.com. I have only a little sold