Strange laser noise on Philips CD100 (CDM0)

I've just finished a full recap and service on my recently acquired Philips CD100 vintage CD player.

After overcoming a few unexpected issues the player now reads and plays well part from the fact that towards the end of a disc, say track 10 or 11 on a typical album, the player starts to make a strange high pitched ringing noise.

It sounds just like running a wet finger around the rim of a wine glass! Up to around track 10 it is silent and then beyond that point the ringing noise starts.

Has anyone here ever experienced a problem like this and what did you do about it?
 
Check the routing of the cables to and from the Mechanism.
I have had similar problems with a player I tried to make.

P
 

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