Laser Replacements, PS3 Games & DVD's, but no Blu-Ray?

I repair various consumer electronics mainly game consoles and Macs. For some time now, we've been seeing A LOT of issues when we replace PS3 400AAA lasers, to that where the "repaired" unit will read DVD's and PS3 games just fine but it will not read Blu-Ray movies at all. Even resetting the video settings and restoring the unit to factory defaults, does not work. Are there any tips from you all or fixes that you'd be willing to share? It would be most greatly appreciated!!! Really, any help or comment at all.. lol