We have recently slipped our 2004 B36 for the first serious inspection and maintenance since the pre purchase survey four months ago. I was shocked to see a gap had opened up at the top of the leading edge of the lead keel. I scraped out the remaining sealant, resealed with polyurethane sikaflex, torqued up the keel bolts, wiped off the excess sealant and all is good. I will certainly add a retorquing of the keel bolts to the maintenance schedule.