Do I worry about whether the service manager likes me or not? Not now or ever. I learned years ago, bosses have favorites, or the appearances of such. I do my job to gain the praise of one, and that one is not of this world. I learned this, you do the job right the first time, and yes we all make mistakes, you do the job in a timely manner, the customer is happy, not calling complaining about the costs, turn in paperwork timely( one of my particular weaknesses), keep your inventory close, lost or unapplied time to a minimum, show up everyday you are scheduled for, you will get good reveiws. Do what's asked of you, if that's butt kissing, so be it. I answer to a higher authority than the man behind the desk, who merely signs off on things. I think you should work for the company that employs you just like you would work if you owned the company.
Move to sevice manager? NOT!!!!!! No shops close enough to my house for that. It's two hours from here. And those bonuses.... better left unsaid, but there are many ways to sweeten that pot.
If you take care of your business, and your job, you won't have time to worry about what someone else is getting or doing. If you take care of your responsibilities, the rest will take care of itself. If you are looking for perfect fairness, you will forever be looking.