good troubleshooting to find the cause of the problems the "shop" created for you.
get a cup of hortons, drive over the krispy-kreme in missasawga (sp?) to get a "real" donut, relax and read the shop manual to to find important details such as that.
ps- if the fasteners you mentioned are of the "nyloc" type utilizing an insert, they should hold just fine if the insert was not damaged. OTOH, new fasteners may provide cheap piece of mind while speeding down the 407. only trouble now is the OPD!