Troubleshoot M92A Multimeter

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😕Hi all i'm a new to the site and i was wondering if anyone can give me some advice, i have M92A multimeter and as soon as i turn it to continuity test it starts buzzing without being connected to anything the rest of the meter appears to be ok, i have looked at the pcb and all the resistors components look are surface mounted buy 2 look like they have had the solder re-run by hand (R20 + R21) i was wondering if anyone knows if these control the continuity test part of the meter thanks.
 
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