Yep - Marvin's guide has it covered.

Gently heat up the insert from under the playfield and "tap" the insert out. If possible, try it on an old playfield if you have one lying around.

$#$thanks for that strange ,I didnt know about the heating up bit ,its weird because its not a couple of inserts, its all of the inserts. I suppose i try it with hair dryer as i havnt got a heat gun