OK guys,
Vans replied and its only half bad
.
"Only partial bad news on the rear spar. Engineering wants the doublers, W-
707G and D to be replaced. The spar is OK. Be careful; drilling out the
rivets or you may have to replace the spar also.
As a reminder, do not drill though the rivet. Drill just through the head and
then pop it off with a prying action with a tight fitting punch or the shank of a
drill. Then punch out the rivet shank or pull it out using a side cutter to grab
it tight. That way the hole is not compromised.
Counting the ribs from the root (as number one), towards the tip, on the
second and third rib, ignore the extra holes in the spar web. On the fourth
rib, put two blind rivets (LP4-3) in the extra holes in the web."
I'll probably have to get a spar because I bet I'll screw up drilling out the rivets.