should my work be warrented

I just had my ims baring replaced about 3 months ago on my 2001 Porsche
Boxster s with 83,000 miles. now the check engine light is on. the code says
timing chain and lower cam issues . i was told that a standerd proceedure
these two items should have been inspected during the ims replacement and
the new work should be warented is this correct