Folks, if ever you need to replace transport draw belt or laser assembly, herewith link with detailed instructions. Got the belt at local spare shop R10 and replaced on my SA-11S1, works perfectly.
https://www.stereo.net.au/forums/topic/81872-marantz-sa-11s1-cd-player-basic-renoservice-warning-pic-heavy/
https://www.stereo.net.au/forums/topic/81872-marantz-sa-11s1-cd-player-basic-renoservice-warning-pic-heavy/