[John_AZ]

The rollers will last at least 45K---Porsche suggests 60K but that is too much.
FYI the origninal rollers put on when new were defective and cracked --just history.

Your rollers should be OK.
Just get the belts.

When you pull the belts off, spin the rollers and feel for "grit" , noise, wobble----now you have to get a new roller. This is just a basic check, yours should be OK.

If the engine seal kit was done 10K ago, it should be OK. When you pull the rear belt guards you can check for leaks & oil paths if you do not see them now.

When the engine seal kit was done, the front crank seal and "O" ring should have been replaced as well. You can check if it is leaking by seeing if oil is leaking from the front crank down the oil pan. If you see a leak you have to replace the front crank seal and "O" ring.
FYI--a new front crank seal will be ruined if the oil pump sleeve has a groove from the front crank seal lips that touch the crank. If any oil has pooled on the inside lower belt covers the seal is bad as well and need to be replaced.

GL
John