Do some software maintenance

Hello, The company I represent hired a freelancer to develop and bought a software developed in C#. Software collecting different types of data for a one year period. But we are facing 2 issues, probably a database related problems and we need a person able to fix these issues. The importance of data we collect is high so we need to solve these 2 issues within 1-2 day period. Selected person should also be interested to work for possible future maintenance/improvements of the software. The software will be shared with the selected person. More details, images and detailed explanation about this I will share with shortlisted candidates. Thanks.