My dryer was repaired by a tech he replaced the bearing . But now the dryer is making the same noise just not as loud.

Did it make this noise while the tech was still there, what did he say?

Yes it was making the noise only it was a squealing noise at that time so he replaced the bearings. Now the noise has come back only not as loud

Call the tech back for a free callback, he did not fix it properly and there should be no new charge except for new parts