[Outback Porsche]

Can understand about the component replacement but have a look at the electrolytic caps. If the ends of them have weeped or shrunk, then they need to be replaced. If you do replace them, remember they are polarized (take a photo so you remember the correct orientation). Find someone to help if your unsure, and when in doubt - leave it be.

Best if you can get a temperature controlled iron (@ around 300-320DegC). Make sure you use 63/37 or 60/40 solder to add to the solder joints if your just going to 'freshen' them up. Do not use LEAD FREE (Pb Free) solder to 'touch' up your joints. You will create a weak solder joint from the alloy it'll make.

Because the solder joints are old, you should use a liitle liquid flux to help the solder to flow (it removes contaminants, you'll get a better joint and it'll be easier to solder). If you can't get any flux, choose rosin cored solder (it's got flux in it - but not much).

Another tip - Dont spend more than 5 seconds with the iron tip on the joint/lead. You'll damage the circuit board and the pad will begin to de-laminate from the board.

Have fun.