If only happen during the start up, probably is the STARTER issue. I had my starter repaired and service (changed carbon brushes n apply new grease) for my 14 years old Altis after the start up noise came in more often (start with once in a few weeks to later once in few days). The carbon brushes were heavily worn out and dry grease are the contribution to noise *shh...." after key turn to start position. Earlier the mechanic told me I hold to the start too long after turn to start.

If you have the similar incident like mine, Starter is the cause of the problem. I get it fix up just over RM100+.

You did mention before your alternator and starter were repaired earlier. By all mean did you there when they serviced both parts....?