Buying a 92 Lexus SC300...help

Does anybody know of common problems or anything I need to watch out for. I am buying a 92 Lexus SC300. Any input would help. Any sites that show fixes to some of the problems or maintanence procedures. Wireing diagrams ..ect

Headlight units are prone to leakage, where water gets in and can't get out. The lights continue to work, but the sloshing and fogging bother many owners. Dealer price for new units is $700 per side. Some owners report loosening the sealant with a hairdryer, then re-sealing with silicone and reinstalling the lights.

I'd get permission to wash the prospective purchase and make sure the lights stay dry inside!