No /dev/sr0 in stretch upgrade from jessie

[hilltownboy]

There is no /dev/sr0 in my stretch upgrade from jessie, so I can't use cdroms. Trying to load module sr_mod, I reach the following dead end:

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~$ sudo modprobe 4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko
modprobe: FATAL: Module 4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko not found in directory /lib/modules/4.9.0-3-686-pae

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$ sudo ls -l /lib/modules/kernel/drivers/scsi/sr_mod.ko
ls: cannot access '/lib/modules/kernel/drivers/scsi/sr_mod.ko': No such file or directory

Yet the following shows that sr_mod.ko is there:

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name@debian:/lib/modules/4.9.0-3-686-pae/kernel/drivers/scsi$ ll sr_mod.ko
-rw-r--r-- 1 root root 25148 Aug  6 00:24 sr_mod.ko

Also:

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~$ sudo modinfo sr_mod
filename:       /lib/modules/4.9.0-3-686-pae/kernel/drivers/scsi/sr_mod.ko
license:        GPL
alias:          scsi:t-0x04*
alias:          scsi:t-0x05*
alias:          block-major-11-*
license:        GPL
description:    SCSI cdrom (sr) driver
depends:        scsi_mod,cdrom
intree:         Y
vermagic:       4.9.0-3-686-pae SMP mod_unload modversions 686 
parm:           xa_test:int

Would appreciate help.

[deborah-and-ian]

Did you have some sort of custom kernel installed (compiled or from external repo)?

[hilltownboy]

No custom kernel

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uname -a
Linux debian 4.9.0-3-686-pae #1 SMP Debian 4.9.30-2+deb9u3 (2017-08-06) i686 GNU/Linux

This kernel came upgrading