Well I got my HH going yesterday after a few problems, I have spent a couple of days trying to sort out a switch matrix problem, that was the only problem at the start.
I powered Haunted House up and started playing a game, the ball landed in the top kicker hole, but the ball did not kick out and did not score any points.I then tested some other targets and gates, none of them scored points.
I looked up the switch matrix in the manual and in Clays repair guides and found that I had two columns of switches not working, I swapped the 7400 chips with each other, no change, I swapped the 7404 chips with each other, no change, I swapped the RIOT chip with the one on the sound board, still no change, I checked continuity between the board and the connector plug, this checked out ok. I checked all the diodes, they were all ok.
I checked for broken wires under the PF and continuity between the A1-J6 plug and the switches involved under the PF, they checked out ok.

So I had spent about 5 to 6 hours on this problem, so I decided to pull the cpu out and take it upstairs in the warm and check every chip for continuity to the board, This board and the whole machine was working fine before the restoration, all I done was the ground mods and replaced the 5101 and cleaned the edge contacts, any way I had just about had enough after testing all the chips, but for some reason I decided to check the A1-J6 contacts for continuity further up the traces, one probe on the copper contact and the other end on the trace where it connects to a chip, BINGO two traces had no continuity, they had hair line cracks at the connecter, a bit of solder and the board is working fine again.

I done the mod to the up kicker by adding a pop bumper board to the lower PF, man this mod is defiantly worth doing the kicker has not missed kicking the ball first time every time, and it has a lot more powerful kick with it.

The other problem that developed after a couple of games was weak flippers, I adjusted the EOS switch witch has made a big difference.

I still have to de rust the legs and give the coin door a scrub.

The game plays so much better now that it has been re rubbered, it is very fast, a completely different game to six months ago.

Cheers Ian

pic... broken traces in the red circle.