While overhauling a 1991 Santana Sovereign (steel), I noticed a sloshing sound when I turned the bare frame in the work stand. Sounds like a liquid in the frame. But, the tubes are sealed - no holes in the bottom brackets, head tube or even the water bottle bosses.
So now I have a problem. Leave as is or drill some holes to let the liquid out. Spoke with Santana and they were puzzled but eventually said the a frame builder around the time (1991) liked to seal the tubes completely to avoid water and corrosion. Apparently the water part did not work.
What do you think - leave it or let it out?