In regards to the ES II requiring the holding down of the shutter button to get correct (especially long) exposures, "5tax" stated in another post in 2013, "You can either take it to be repaired, or you can remove the
base plate and check the shutter release shaft and associated switch parts to see what is wrong."
Can "5tax" or anyone else elaborate on this, specifically, does resolving this problem require a mechanical adjustment or replacement/adjustment of an electrical part. Thanks in advance.