I bought my first pin, a non-working Lucky Seven, back in september. It had no battery acid damage, but i think the previous owner messed it up by using the wrong fuses. Both LEDs on the CPU board stayed on. I reflowed all the header pins plus the inter-board connector, replaced the 5101 chip and replaced the old ROMs by an eprom adapter board (single eprom). Some of the chip sockets were already replaced with better ones. I also replaced the power supply with an overhauled one, which did nothing except for all the GI come up (before that only the playflied was lit up). Since i´m lacking the knowledge and time i decided to go with all three System 3 boards available from Jeff. My Lucky Seven fired right up and was ready to play. From the mail communication Jeff seems to be a good guy, too.